| Jan Kratochvíl | Charles University, Prague, Czech Republic |
| Tomáš Madaras | P. J. Šafárik University in Košice, Slovakia |
| Andrzej Ruciński | Adam Mickiewicz University, Poznań, Poland |
| Elżbieta Sidorowicz | University of Zielona Góra, Poland |
| Mariusz Woźniak | AGH University of Science and Technology, Kraków, Poland |
