Prof.-Dr. W. R"uhl, Department of Physics, University of Kaiserslautern, Germany, June 2003

Prof.-Dr. O. Lechtenfeld, Institute for Theoretical Physics, University of Hannover, Germany; July 2003, November 2006 and November 2007

Prof.-Dr. R. Grimm, Center for Theoretical Physics, University of Marseille, France, November 2006

Prof.-Dr. S.J. Gates Jr., University of Maryland at College Park, USA, November 2006

Prof.-Dr. A. Chatrabhuti, Chulalongkorn University, Bangkok, Thailand, November-December 2017, December 2019

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