| C.E. Praeger , The University of Western Australia, Nedlands, Australia, Nov. 7-18, 1994 |
| E. Izadi , Harward University, Cambridge, USA, Aug. 17 - Sep. 6, 1994 |
| H. Marandjian , Institute for Informatics and Automation Problems, Yerevan, Republic of Armenia, Aug. 1 - Sep. 1, 1994 |
| H. Shahgholian , Royal Institute of Technology, Stockholm, Sweden, July 2 - Aug. 22, 1994 |
| A.S. Morozov , Novosibirsk State University, Novosibirsk, Russia, July 1 - Oct. 1, 1994 |
| A. Enayat , American University, Washington, USA, June 1 - July 1, 1994 |
| F.R. Drake , Leeds University, Leeds, UK, May 1 - June 1, 1994 |
| D. Anasov , Steklov Mathematical Institute, Moscow, Russia, April 21 - May 5, 1994 |
| H. Kharaghani , University of Lethbridge, Lethbridge, Canada, April 1 - Aug. 1, 1994 |
| S.S. Goncharov , Novosibirsk State University, Novosibirsk, Russia, Jan. 1 - Feb. 1, 1994 |
| A. Enayat , American University, Washington, USA, Jan. 1 - May 1, 1994 |
| A. Enayat , American University, Washington, USA, Jan. 1 - May 1, 1994 |
| V.G. Kanovei , Moscow State University, Moscow, Russia, Oct. 15, 1993 - Jan. 6, 1994 |
| B. Kalantari , Rutgers University, New Brunswick, USA, Oct. 1, 1993 - July 1, 1994 |
| M.R. Emamy-K , University of Puerto Rico at Rio Piedras, Rio Piedras, USA, Aug. 1, 1993 - Feb. 1, 1994 |
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