| A. Morozov , ITEP, Moscow, Russia, Oct. 28 - Nov. 11, 1993 |
| Alexy Morozov , Moscow Institue of Physics & University of Amesterdam, Moscow, Russia, Oct. 27 - Nov. 11, 1993 |
| N.M. Singhi , Tata Institute of Fundamental Research, Bombay, India, Sep. 3-10, 1993 |
| O. Lehto , University of Helsiniki, Helsiniki, Finland, May 6 - June 6, 1993 |
| R.I. Grigorchuk , Steklov Mathematical Institute, Moscow, Russia, April 8 - May 14, 1993 |
| C. Lindner , Auburn University, Auburn, USA, March 30 - April 1, 1993 |
| Isac Khalatnikov , L.D. Landau Institute of Theoretical Physics, Moscow, Russia, Dec. 14, 1992 - Jan. 7, 1993 |
| F.H. Bermbach , Johannes-Gutenberg Universitat, Mainz, Germany, Oct. 1, 1992 - May 1, 1993 |
| V. Lyubetski , IPPI, Academy of Science, Moscow, Russia, Sep. 1, 1992 - May 1, 1993 |
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