1999-1999
Ancient Olympia, Greece:  During the visit to the Fifth International Symposium on Orthogonal Polynomials, Special Functions and Their Applications, held in September, 1999.       
 Patras, Greece:  

    
HongKong-Participants
Athens, Greece:   September, 1999.
 
Hong Kong:  At the International Workshop on   Special Functions: Asymptotics, Harmonic Analysis and Mathematical Physics, held in June, 1999.