 | Werner Nahm , University of Bonn, Germany, Bonn, Germany,
April 4 - June 5, 1992 |
| Mehran Kardar , Institute of Masachussete, USA, Masachussete, USA,
April 4 - July 6, 1992 |
| H. Bass , Columbia University, New York, USA,
April 1 - May 1, 1992 |
| J. Hubbard , Cornell University, Ithaca, USA,
March 1 - April 1, 1992 |
| C. Pugh , University of California , Berkeley, Berkeley, USA,
March 1-31, 1992 |
| J.-C. Yoccoz , University of Paris 11, Paris, France,
March 1 - April 1, 1992 |
|
