 | Alexy Morozov , Moscow Institue of Physics & University of Amesterdam, Moscow, Russia,
Oct. 27 - Nov. 11, 1993 |
| O. Lehto , University of Helsiniki, Helsiniki, Finland,
May 6 - June 6, 1993 |
| Isac Khalatnikov , L.D. Landau Institute of Theoretical Physics, Moscow, Russia,
Dec. 14, 1992 - Jan. 7, 1993 |
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