![School of Physics](http://www.ipm.ac.ir/images/Physics_circle.gif) | Werner Nahm , University of Bonn, Germany, Bonn, Germany, April 4 - June 5, 1992 |
![School of Physics](http://www.ipm.ac.ir/images/Physics_circle.gif) | Mehran Kardar , Institute of Masachussete, USA, Masachussete, USA, April 4 - July 6, 1992 |
![School of Physics](http://www.ipm.ac.ir/images/Physics_circle.gif) | H. Bass , Columbia University, New York, USA, April 1 - May 1, 1992 |
![School of Physics](http://www.ipm.ac.ir/images/Physics_circle.gif) | J. Hubbard , Cornell University, Ithaca, USA, March 1 - April 1, 1992 |
![School of Physics](http://www.ipm.ac.ir/images/Physics_circle.gif) | C. Pugh , University of California , Berkeley, Berkeley, USA, March 1-31, 1992 |
![School of Physics](http://www.ipm.ac.ir/images/Physics_circle.gif) | J.-C. Yoccoz , University of Paris 11, Paris, France, March 1 - April 1, 1992 |
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