PLASTRIA FRANK A. A.

CURRICULUM VITAE

Oct 10, 2011

Personal data  

Current position (since Oct 1988)  

Office Address   

Research fields    


Location theory, mathematical programming, convex analysis, computational geometry, global optimisation, graph theory, automatic classification.

Higher Education  

Languages  

Scientific coordination and editorial activities  

Referee for following journals (around 10 per year)  

Collaboration with  

Member of following societies  

Scientific Publications  


   In Refereed Journals  

  1. F.Plastria, A note towards improved homeland defense, OMEGA,Volume 40, Issue 2, April 2012, Pages 244-248

    http://dx.doi.org/10.1016/j.omega.2011.05.006

  2. F.Plastria, M.Elosmani, Continuous location of an assembly station, TOP First online (April 2011) 18p, DOI 10.1007/s11750-011-0185-9

    http://www.springerlink.com/content/hq1w211m51ht2u6r/

  3. F.Plastria, Comments on: Routing problems with loading constraints, TOP 18 (1) (July 2010) 34-35

    http://www.springerlink.com/content/hq1w211m51ht2u6r/

  4. F.Plastria, E.Carrizosa, Minmax-distance approximation and separation problems. Geometrical properties, Mathematical Programming, First Online (June 2010), 25p, DOI: 10.1007/s10107-010-0387-1

    http://dx.doi.org/10.1007/s10107-010-0387-1

  5. A.J.Lozano, J.A.Mesa, F.Plastria, The k-Centrum Straight-line Location Problem, Journal of Mathematical Modelling and Algorithms, 9 (1) (March 2010), 1-17.

    http://dx.doi.org/10.1007/s10852-009-9119-z

  6. A.J.Lozano, J.A.Mesa, F.Plastria, Finding an Euclidean Anti-k-Centrum Location of a Set of Points, Computers and Operations Research, 37(2) February 2010, 292-301.

    http://dx.doi.org/10.1016/j.cor.2009.05.001

  7. F.Plastria, S.De Bruyne, E.Carrizosa, Alternating local search based VNS for linear classification, Annals of Operations Research (2010), 174(1)February 2010, 121-134.

    http://dx.doi.org/10.1007/s10479-009-0538-z

  8. T. Geudens, C. Macharis, F. Plastria, J. Crompvoets, Assessing Spatial Data Infrastructure Strategies Using the Multi-Actor Multi-Criteria Analysis, International Journal of Spatial Data Infrastructures Research, 4 (2009) 265-297.

    http://ijsdir.jrc.ec.europa.eu/index.php/ijsdir/article/viewFile/123/220

  9. A.J.Lozano, F.Plastria, The ordered median euclidean straight-line location problem, Studies in Locational Analysis, 17, September 2009, 29-43.

  10. Boglárka Tóth, Frank Plastria, José Fernández, Blas Pelegrín, On the impact of spatial pattern, aggregation, and model parameters in planar Huff-type competitive location and design problems, OR Spectrum 31 (3) June, 2009, 601-627.

    http://www.springerlink.com/content/m87l53u508846w73/fulltext.pdf

  11. F.Plastria, L.Vanhaverbeke, Maximal covering location problem with price decision for revenue maximization in a competitive environment, OR Spectrum 31 (3) June, 2009, 555-571.

    http://www.springerlink.com/content/6142t727438826h6/fulltext.pdf

  12. Boglárka Tóth, José Fernández, Blas Pelegrín, Frank Plastria, Sequential versus simultaneous approach in the location and design of two new facilities using planar Huff-like models, Computers and Operations Research, 36 (2009) 1393-1405.

  13. F.Plastria, G.Sonck, W.Jacquet, Convex metrics revisited, Acta Mathematica Vietnamica, 34, 1 (2009), 103-108.

  14. F.Plastria, M.Elosmani, On the convergence of the Weiszfeld algorithm for continuous single facility location-allocation problems, TOP, 16, 2 (2008), 388-406.

  15. F.Plastria, Asymmetric distances, semidirected networks and majority in Fermat-Weber problems, Annals of Operations Research, 167 1, March, 2009, 121 - 155.

    http://dx.doi.org/10.1007/s10479-008-0351-0

  16. Yoshiaki Ohsawa, Naoya Ozaki & F.Plastria, Equity-efficiency bicriteria location with squared euclidean distances, Operations Research, 56 (2008) 79-87

  17. M.Cera, J.A.Mesa, F.A.Ortega, F.Plastria, Locating a central hunter on the plane, Journal of Optimization Theory and Applications, 136, 2 (2008), 155-166

    http://dx.doi.org/10.1007/s10957-007-9293-y

  18. F.Plastria, L.Vanhaverbeke, Discrete models for competitive location with foresight, Computers and Operations Research, 35, 3, 2008, 683-700,

    http://dx.doi.org/10.1016/j.cor.2006.05.006

  19. Y.Ohsawa, N.Ozaki, F.Plastria, K.Tamura, Quadratic Ordered Median Location Problems, Journal of the Operations Research Society of Japan, 2007, 50, 4, 540-562

  20. E.Carrizosa, F.Plastria, Optimal expected-distance separating halfspace, Mathematics of Operations Research,2008, 33, 3, 662-677.

    http://dx.doi.org/10.1287/moor.1070.0309

  21. F.Plastria, L.Vanhaverbeke, Aggregation without loss of optimality in competitive location models, Networks and Spatial Economics, 7 (2007) 3-18.

    http://dx.doi.org/10.1007/s11067-006-9004-5,

  22. J. Fernández, F. Plastria, B. Pelegrín and B.Tóth, Planar location and design of a new facility with inner and outer competition: an interval lexicographical-like solution procedure, Networks and Spatial Economics, 7 (2007) 19-44.

    http://dx.doi.org/10.1007/s11067-006-9005-4

  23. E.Carrizosa, B.Martin-Barragan, F.Plastria & D.Romero-Morales, On the selection of the globally optimal prototype subset for NN classification, INFORMS Journal On Computing Vol. 19, No. 3, Summer 2007, pp. 470-479

    http://dx.doi.org/10.1287/ijoc.1060.0183

  24. J.Fernández, B.Pelegrín, F.Plastria, B.Tóth, Solving a Huff-like competitive location and design model for profit maximization in the plane, European Journal of Operational Research, 179, 3 (June 2007) 1274-1287.

    http://dx.doi.org/10.1016/j.ejor.2006.02.005

  25. F.Plastria, Four-point Fermat location problems revisited. New proofs and extensions of old results, IMA Journal of Management Mathematics, 17, 2006, 387-396.

  26. Y.Ohsawa, F.Plastria, K.Tamura, Euclidean push-pull partial covering problems, Computers and Operations Research, Volume 33 (12), 2006, 3566-3582

  27. F.Plastria, Avoiding cannibalisation and/or competitor reaction in planar single facility location, Journal of the Operational Research Society of Japan, 48 (2), 2005, 148-157.

  28. N.Mladenovic, F.Plastria & D.Urosevic, Reformulation descent applied to circle packing problems, Computers and Operations Research 32 (9), 2005, 2419-2434

  29. F.Plastria & E.Carrizosa, Optimal location and design of a competitive facility, Mathematical Programming 100, 2004, 247-265

    http://dx.doi.org/10.1016/j.ejor.2006.02.005 DOI 10.1007/s10107-003-0468-5, Sept 30, 2003.

  30. C.Michelot & F.Plastria, An extended multifacility minimax location problem revisited, Annals of Operations Research 111 (2002) 167-179

  31. F.Plastria, Formulating logical implications in combinatorial optimisation, European Journal of Operational Research, 140 (2002), 2, 338-353.

  32. J.Krarup, D.Pisinger & F.Plastria, Discrete location problems with push-pull objectives, Discrete Applied Mathematics, 123 (2002), 363-378.

  33. F.Plastria, On the choice of aggregation points for continuous p-median problems: a case for the gravity centre, TOP, 9 (2001) , 217-242.

  34. F.Plastria & E.Carrizosa, Gauge-distances and median hyperplanes, Journal of Optimisation Theory and Applications, 110, 1, 2001, 173-182.

  35. F.Plastria, Static competitive facility location: an overview of optimisation approaches, European Journal of Operational Research, 129(3), 2001, 461-470.

  36. F.Plastria, Pentomino exclusion and spanning. IP formulation, valid inequalities and facets, JORBEL, 40 (2000), 25-45.

  37. E.Carrizosa & F.Plastria, Dominators for multiple-objective quasiconvex maximization problems, Journal of Global Optimisation, 18, 1, 2000, 35-58.

  38. N.Mladenovi\'c & F.Plastria, A note on the continuous p-defense-sum problem, Yugoslav Journal of Operations Research, 10, 2000, 299-302.

  39. F.Plastria, New errorbounds in continuous minisum location for aggregation at the centre of gravity, Studies in Locational Analysis, 14, 2000, 101-119.

  40. E.Carrizosa & F.Plastria, Polynomial algorithms for parametric minquantile and maxcovering planar location problems with locational constraints, TOP, 6,2, 1998, 179-194.

    http://dx.doi.org/10.1007/BF02564786

  41. P.H.Peeters & F.Plastria, Discretization results for the Huff and Pareto-Huff competitive location models on networks, TOP, 6,2, 1998, 247-260.

    http://dx.doi.org/10.1007/BF02564790

  42. F.Plastria & E.Carrizosa, Undesirable facility location with minimal covering objectives, European Journal of Operational Research, 119, 1 1999, 158-180.

  43. E.Carrizosa & F.Plastria, Location of semi-obnoxious facilities, Studies in Locational Analysis, 12,1999, 1-27.

  44. F.Plastria & K.Rosing, Understanding spatial inertia: a comment on Tellier and Vertefeuille, Journal of Regional Science, 38, 3, 1998, 505-511.

  45. E.Carrizosa & F.Plastria, Locating an undesirable facility by generalized cutting planes, Mathematics of Operations Research, 23, 3, 1998, 680-694.

  46. F.Plastria, Profit maximising single competitive facility location in the plane, Studies in Locational Analysis, 11, 1997, 115-126.

  47. F.Plastria, Optimal location of undesirable facilities: a selective overview, JORBEL 36, 1996, 109-127.

  48. E.Carrizosa & F.Plastria, A characterization of efficient points in constrained location problems with regional demand, Operations Research Letters, 19, 1996, 129-134.

  49. F.Plastria & E.Carrizosa, Geometrical characterization of weakly efficient points, Journal of Optimisation theory and applications, 90, 1, 1996, 217-223.

  50. E.Carrizosa & F.Plastria, On minquantile and maxcovering optimisation, Mathematical Programming, 71, 1995, 101-112.

  51. E.Carrizosa & F.Plastria, The determination of a least quantile of squares regression line for all quantiles, Computational Statistics and Data Analysis, 20, 1995, 467-479.

  52. F.Plastria, Fully geometric solutions to some planar minimax location problems, Studies in Locational Analysis, 7, 1994, 171-183.

  53. F.Plastria, Continuous location anno 1992, a progress report, Studies in Locational Analysis, Vol. 5, 1993, 85-127.

  54. F.Plastria, A note on ä special problem on rectangular floorplans solvable in polynomial time" of G. Bär, EIK, Journal of Information Processing and Cybernetics, 29, 3, 1993, 175-178.

  55. F.Plastria, On destination optimality in asymmetric distance Fermat-Weber problems, Annals of Operations Research, 40, 1992, 355-369.

  56. F.Plastria, GBSSS, the generalized big square small square method for planar single facility location, European Journal of Operational Research, 1992,62, 2, 163-174.

  57. F.Plastria, When facilities coincide: exact optimality conditions in multifacility location, Journal of Mathematical Analysis and Applications, 169, 2, 1992, 476-498.

  58. F.Plastria, The effect of majority in Fermat-Weber problems with attraction and repulsion in pseudometric spaces, Yugoslav Journal of Operations Research, 1, 2, 1991, 101-106.

  59. F.Plastria, Optimal gridpositioning or single facility location on the torus, RAIRO-Recherche Operationelle, 25, 1, 19-29, 1991.

  60. O. Lefebvre, C. Michelot & F.Plastria, Sufficient conditions for coincidence in minisum multifacility location problems with a general metric, Operations Research, 39, 3, 437-442, 1991.

  61. O. Lefebvre, C. Michelot & F.Plastria, Geometric interpretation of the optimality conditions in multifacility location and applications, Journal of Optimisation Theory and Applications, 65, 1, 85-101, 1990 - Errata Corrige, 68, 2, 393-394, 1991.

  62. F.Plastria, The minimization of lower subdifferentiable functions under nonlinear constraints: an all feasible cutting plane algorithm, Journal of Optimization Theory and Applications, 57, 3, 463-484, 1988.

  63. L. Kaufman & F.Plastria, The Weber problem with supply surplus, Belgian Journal of Operations Research, Statistics and Computer Science, 28, 1988, 15-31.

  64. F.Plastria, Solving general continuous single facility location problems by cutting planes, European Journal of Operational Research, 29, 1987, 98-110.

  65. F.Plastria, Two hierarchies associated with each clustering scheme, Pattern Recognition, 19, 1986, 193-196.

  66. B. Pelegrin, C. Michelot & F.Plastria, On the uniqueness of optimal solutions in continuous location theory, European Journal of Operational Research, 20, 1985, 327-331.

  67. F.Plastria, Lower subdifferentiable functions and their minimization by cutting planes, Journal of Optimization Theory and Applications, 46, 1985, 37-53.

  68. L. Kaufman, S. Tubeeckx & F.Plastria, The zero-one knapsack problem with equality constraint, European Journal of Operational Research, 19, 1985, 384-389.

  69. F.Plastria, Localization in single facility location, European Journal of Operational Research, 18, 1984, 215-219.

  70. F.Plastria, A note on `Fixed point optimality criteria for the location problem with arbitrary norms', Journal of the Operational Research Society, 34, 1983, 164-165.

  71. D.L. Massart, L. Kaufman & F.Plastria, Non-hierarchical clustering with MASLOC, Pattern Recognition, 16, 1983, 507-516.

  72. F.Plastria, Points efficaces en localisation continue, Cahiers du Centre d'Etude en Recherche Opérationnelle de l'ULB, 25, 1983, 329-332.

  73. F.Plastria, Testing whether a cutting plane may be dropped, Belgian Journal of Operations Research, Statistics and Computer Science, 22, 1982, 11-21.

  74. F.Plastria & D. Van Oudheusden, Un modèle de localisation comme application de la théorie des jeux, Annales de la Faculté des Sciences de Kinshasa, Zaï re, Sect. Math. Phys., 4, 1978, 247-268.

  75. F.Plastria, Tightness in the lattice of topologies, Annales de la Faculté des Sciences de Kinshasa, Zaï re, Sect. Math. Phys., 4, 1978, 171-185.

  76. F.Plastria, Connectedness and local connectedness of simple extensions, Bulletin of the Belgian Mathematical Society, 28, 1976, 43-51.

  77. F.Plastria, Covers in the lattice of topologies, Bulletin of the Belgian Mathematical Society, 27, 1975, 295-307.

  78. F.Plastria, Two loose results in general topology, Bulletin of the Belgian Mathematical Society, 24, 1972, 380-385.


   Chapters in Books  
  1. F.Plastria, The Weiszfeld algorithm: proof, amendments and extensions, chapter 16 in H.A.Eiselt and V.Marianov (Eds.) Foundations of Location Analysis, International Series in Operations Research and Management Science, vol 155, Springer, 2011, 357-389

  2. J.Fernández, B.Pelegrín, B.Tóth, F.Plastria, Localización competitiva en el plano con decisiones en diseño, in B. Pelegrin (Ed.) Avances en Localización de Servicios y sus Aplicaciones, Servicio de Publicaciones, Universidad de Murcia, 2004, 109-137

  3. F.Plastria, Continuous covering location problems, in H.Hamacher and Z.Drezner (eds.), Location Analysis: Theory and Applications, Springer, 2001, Chapter 2, 39-83.

  4. E.Carrizosa & F.Plastria, Métodos de localización, Capí tulo 15 in A.P.Acosta & L.P.Guijosa (eds.), Perspectivas en estadí stica e investigación operativa, Universidad de Jaén, Spain, 2000, 403-423 (in spanish).

  5. F.Plastria, Continuous location problems, Chapter 11 in Drezner (Ed.), Facility Location: a survey of applications and methods, Springer 1995, 229-266.


   In Proceedings  

  1. S.Debruyne, F.Plastria, 2-class Eigen Transformation Classification Trees, Proceedings of the KDIR 2009 Conference, Madeira Portugal, Institute for Systems and Technologies of Information, Control and Communication; Madeira, Portugal, Oct 2009, ISBN 978-989-674-011-5, 251-258,

  2. F.Plastria, S.Debruyne, E.Carrizosa, Dimensionality reduction for classification: comparison of techniques and dimension choice, in Advanced Data Mining and Applications, 4th International Conference, ADMA 2008, Chengdu, China, October 8-10, 2008. Proceedings LNCS 5139, Springer, 2008, 411-418

  3. N.Mladenovic, F.Plastria & D.Urosevic, Formulation space search for circle packing problems, in Engineering Stochastic Local Search Algorithms, Designing, Implementing and Analyzing Effective Heuristics, International Workshop SLS2007, Brussels, Belgium Sept 2007, Proceedings, Edited by T.Stützle, M.Birattari,H.H.Hoos, LNCS 4638, Springer, 2007, 212-216

  4. J.Fernández, B.Pelegrín, F.Plastria, B.Tóth, Reconciling franchisor and franchisee: a planar biobjective competitive location and design model, in Recent Advances in Optimization. Proceedings of the 12th French-German-Spanish Conference on Optimization held in Avignon, September 20-24, 2004, Edited by A. Seeger. Lectures Notes in Economics and Mathematical Systems, Vol. 563, Springer-Verlag Berlin Heidelberg, 2006, 375-398.

  5. A.J.Lozano, J.A.Mesa, F.Plastria, Improved results for the k-centrum straight-line location problem, 20th European Workshop on Computational Geometry, Sevilla, Spain, March 2004.

  6. A.J.Lozano, J.A.Mesa, F.Plastria, Ubicacion de un servicio rectilineo atractivo con el criterio k-centrum, III Encuentro Andaluz de Matematica Discreta, San José, Almeria, Spain, sept 2003, 43-46

  7. A.J.Lozano, J.A.Mesa, F.Plastria, El problema del anti-k-centrum en grafos, III Jornadas de Matematica Discreta y Algoritmica, Sevilla, Spain, Sept 2002, p110-113

  8. F.Plastria, Models for competitive location with foresight, in S.Singh, D.K.Nayak, B.S.Mipun (Eds.), Proceedings International Conference on Environment, Locational Decisions and Regional Planning, Shillong, India, The Geographical Society of North-Eastern Hill Region, Shillong, India, 2003, p27-37,
    (also Working paper BEIF/122, sept 2001, 10p.)

  9. J.B.G. Frenk, J. Gromicho, F.Plastria & S. Zhang, A deep cut ellipsoid algorithm and quasiconvex programming, in Komlósi, S., T.Rapcsák, S.Schaible (Eds.) Generalized Convexity, Proceedings, Pécs, Hungary, 1992, LNEMS 405, Springer Berlin, 1994, 62-76.

  10. F.Plastria, A majority theorem for Fermat-Weber problems in quasimetric spaces with applications to semidirected networks, Meeting VI of the EURO Working Group on Locational Analysis, Puerto de la Cruz, Tenerife, Spain, J.A. Moreno (Eds), 1993, 153-165.

  11. O. Lefebvre, C. Michelot & F.Plastria, Boolean linear programming formulation of the attraction tree detection problem, Meeting VI of the EURO Working Group on Locational Analysis, Puerto de la Cruz, Tenerife, Spain, J.A. Moreno (Eds), 1993, 123-134.

  12. W. De Keyser & F.Plastria, The minimum spanning circle problem revisited, Meeting V of the EURO Working Group on Locational Analysis, Namur, F. Orban-Ferange and J.P. Rasson (Eds.), 1990, 54-64.

  13. F.Plastria, The continuous p-centre sum problem, Fourth meeting of the EURO Working Group on Locational Analysis, Chios, Greece, J. Karkazis (Ed.), 1989, 29-38.

  14. F.Plastria, D. Van Oudheusden & S. Svetasreni, Resource smoothing by integer programming, Asia-Pacific Conference on Operations Research, Singapore, 1982, 393-403.

  15. D.L. Massart, L. Kaufman, D. Coomans & F.Plastria, Classification and data structure analysis using advanced clustering techniques - philosophy and methods, Symposium I Anvendt Statistik, Aarhus, Denmark, 1981, 315-325.

  16. F.Plastria & D. Van Oudheusden, An alternative zero-one optimization model for the location of fire stations, Pacific Conference on Operations Research, Seoul, Korea, 1979, 240-248.


   Unpublished Working papers  

  1. A.J.Lozano, J.A.Mesa, F.Plastria, Location of Weighted Anti-Ordered Median Straight Lines, July 2011, 20p.

  2. E.Carrizosa, F.Plastria, Kernel Principal Separation Analysis, sep 2010, Working Paper MOSI/45.

  3. E.Carrizosa, F.Plastria, Principal Separation and Shrinkage Analysis, sep 2010, Working Paper MOSI/46.

  4. Tom Blockmans, Frank Plastria, Lieselot Vanhaverbeke, The Impact of Consumer's Bounded Rationality on Retailer's Price and Location Decisions Working Paper MOSI/44, February 2011, 32p.

  5. A.J.Lozano, J.A.Mesa, F.Plastria, The ordered anti-median problem with distances derived from a strictly convex norm, November 2010, 8p.

  6. F.Plastria, E.Carrizosa, Linear separation and approximation by minimizing the sum of concave functions of distances, Working Paper, 8p, June 2010

  7. J. Gordillo, F. Plastria, E. Carrizosa, Locating a semi-obnoxious facility with repelling polygonal regions, June 2010, 30p.

  8. F.Plastria, Improved fixed point optimality conditions for mixed norms minisum location, Working Paper, 12p, March 2010

  9. S.Debruyne, F.Plastria, Multi-dimensional Data Inspection for Supervised Classification with Eigen Transformation Classification Trees, Working paper, 21p., July 2009.

  10. Emilio Carrizosa, José Gordillo, Frank Plastria, Building separating concentric balls to solve a multi-instance classification problem, jan 2008, 35p. Available at Optimization-online as

    http://www.optimization-online.org/DB_HTML/2008/01/1897.html

  11. Emilio Carrizosa, José Gordillo, Frank Plastria, Kernel Support Vector Regression with imprecise output, jan 2008, 33p. Available at Optimization-online as

    http://www.optimization-online.org/DB_HTML/2008/01/1896.html

  12. Emilio Carrizosa, José Gordillo, Frank Plastria, Support Vector Regression for imprecise data, nov 2007, 35p. Available at Optimization-online as

    http://www.optimization-online.org/DB_HTML/2007/11/1826.html

  13. Emilio Carrizosa, José Gordillo, Frank Plastria Classification problems with imprecise data through separating hyperplanes, sept 2007, 50p. Available at Optimization-online as

    http://www.optimization-online.org/DB_HTML/2007/09/1781.html

  14. I.Thomas, D.Geraets, E.Goetghebeur, O.Janssens, D.Peeters, F.Plastria, P.Chevalier, Locating fire stations: an integrated approach for Belgium, august 2007, 23p.

  15. B. Tóth, F. Plastria, J. Fernández, B. Pelegrín, Sensitivity analysis of the optimal solution to Huff-type competitive location and design problems, November 2008, 26p. Available at Optimization-online as

    http://www.optimization-online.org/DB_HTML/2008/11/2155.html

  16. A.J.Lozano, J.A.Mesa, F.Plastria, The anti-k-centrum problem on networks, November 2006, 12p.

  17. F.Plastria, Table placement, an OR problem?, Working paper MOSI/39, dec. 2006, 6p.

  18. F.Plastria , Location = distances and optimisation, Publications du Département de Mathématique, FUNDP, Namur, Belgium, Report 2003/04, May 2003, 60p

  19. F.Plastria & E.Carrizosa, Arbitrary distance separating halfspaces, Working paper BEIF/124, sept 2002, 9p.

  20. E.Carrizosa, B.Martin-Barragan, F.Plastria & D.Romero-Morales, A dissimilarity-based approach for classification, METEOR Research Memorandum RM/05/048, Maastricht University, The Netherlands, Nov 2005, 40p.

  21. J.Fliege, C.Michelot & F.Plastria, A polynomial time coincidence detector for multifacility location problems, Ergebnisberichte Angewandte Mathematik 152, Institut für Mathematik, Universität Dortmund, 1998, 30p.


   Other Publications  

Editor of books

Guest editor for special issues

Translation

Book reviews

Editorial papers

Abstracts

Participation in externally financed research projects  

Scientific meetings  
   Organisation  
   Invited speaker  
   Other participations  

Participation as speaker, session chairman, stream organiser, program committee member, organisation committee member in numerous international congresses, symposia and workshops. On average around 3.5 per year.

File translated from TEX by TTH, version 2.27.
On 10 Oct 2011, 11:50.