[1]- Mathematics and the 21st Century, Cairo - Egypt 15-20 January 2000.
[2]- International Conference of Topological Methods in Nonlinear Analysis, the Mathematical Conference Center, Badlevo, Poland, 18-23 June, 2001.
[3]- Czechoslovak International Conference on Differential Equations and Their Applications, EQUADIFF 10, Prague, Czech Republic, August 27- 31, 2001.
[4]- School on Population Dynamics, the Mathematical Conference Center, Badlevo, Poland June 17-21, 2002.
[5]- Conference on Mathematical Modeling of population Dynamics, the Mathematical Conference Center, Badlevo, Poland, June 24-28, 2002.
[6]- Periodicities in Difference Equations Workshop, University of Ioannina, Greece, June 5, 2004.
[7]- Texas Dynamics Systems Workshop, Trinity University, San Antonio, USA, April 8-9, 2005.
[8]- Intenational Conference on mathematical Analysis and its Applications, Assiut-Egypt, 3-6 Jauary 2006.
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