Dr. Hernan Aguirre, Shinshu University, Japan
Prof. Kiyoshi Tanaka, Shinshu University, Japan
Prof. Michel Gendreau, University of Montreal
Prof. Pascal Bouvry, University of Luxembourg
Martin Drozdik [PhD student, Shinshu University, Japan, from Nov 2013]
E-G. Talbi, June 2013, Univ. Colchester, Sussex, UK
E-G. Talbi, April 2013, Univ. Murcia, Spain