- Werner Balser (Ulm University)
- Moulay Barkatou (Limoges University)
- Stefan Hilger (Catholic University of Eichstaett)
- Masatake Miyake (Nagoya University)
- Hidetoshi Tahara (Sophia University)
- Masafumi Yoshino (Hiroshima University)
- Henryk Żołądek (Warsaw University)