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ARGENTINA
San Luis, University of Sant Luis, Conicet, Dept. of Mathematics, prof. E. Marchi, 1987.
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AUSTRIA
Laxenburg, International Institute for Applied Systems Analysis, prof. Young, 1981.
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CANADA
Montreal, Concordia University, Dept. of quantitative Methods, prof. G. Pederzoli, 1983.
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CHINA
Dalian, University of Dalian, Institut of Light and Technology, prof. Zhang Sheng-Kai, 1991.
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COLOMBIA
Bogota, University de los Andes, Dept. de Matematica, prof. L.J. Ferro, 2008, 2009.
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LATVLA
Riga, University of Latvia, Dept. of Economics, prof. T. Muravskaya, 1993.
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FRANCE
Marseille, Universités de la Méditerranée, EHESS, CNRS, prof. V. Merlin, 2011.
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ITALY
Universities of Alessandria, Brescia, Catania, Foggia, Genova , Macerata, Messina, Milano (Bicocca, Bocconi, Cattolica, Politecnico), Modena, Napoli (Federico II), Pisa (Scuola Normale), Roma (LUISS), Trieste, Udine.
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NETHERLAND
Maastricht, Dept. of Economics and Business Administration, University of Maastricht, prof. Hans Peters, 1998.
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POLAND
Krakow, AGH University of Science and Management, Faculty of Management, prof. Z Lucki, 2004.
Warsaw, Systems Research Institute of the Polish Academy of Sciences, prof. J. Holubiec, 1989, 1992, 2011.
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SPAIN
Manresa, Universitat Politécnica de Catalunya, Dept. de Matematica Aplicada, prof. J. Freixas, 2000.
Terrassa, Universitat Politécnica de Catalunya, Dept. de Matematica Aplicada, prof. F. Carreras, 2000.
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U.S.A.
Monterey, CA, Naval Postgraduate School, Dept. of Math., prof. Guillermo Owen, 2007.
Newark, NJ, University of Newark, Dept. of Mathematics, prof. L. Papayanopoulos, 1995.
Philadelphia, PA, University of Pennsylvania, Dept. of Mathematics, prof. R.E. Kilhlstrom, 1980.
Princeton, NJ, Princeton University, Dept. of Mathematics, prof. H.W. Kuhn, 1980.
