^1999-2000

Hong Kong:  During thevisit to the International Workshop on Special Functions: Asymptotics, Harmonic Analysis and Mathematical Physics, held in June, 1999.	Hong Kong:  During the visit to the International Workshop on Special Functions: Asymptotics, Harmonic Analysis and Mathematical Physics

Hong Kong:  During the visit to the International Workshop on Special Functions: Asymptotics, Harmonic Analysis and Mathematical Physics	Leuven, Belgium:  During the NINTH International Congress on Computational and Applied Mathematics, held in July, 2000