| Cumrun Vafa , Harvard University, Department of Physics , Cambridge, USA, Nov. 10-17, 2002 |
| M. Sahimi , University of Southern California, Los Angeles, USA, Oct. 29, 2002 |
| Freydoon Mansouri , University of Cincinnati, Cincinnati, USA, April 19 - May 14, 2002 |
| Nodar Tsintsadze , Institute of Physics, Tbilisi, Georgia, March 6 - July 7, 2002 |
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