The text of my lecture on
Integer Valued Entire Functions on Cartesian Products
in: Number Theory in Progress
Proceedings of the International Conference on Number Theory
organized by the Stefan Banach International Mathematical Center in
Honor of the 60th Birthday of Andrzej Schinzel;
Zakopane, Poland, June 30--July 9, 1997;
Ed. Kàlmàn Györy, Henryk Iwaniec and Jerzy Urbanowicz, W.de Gruyter
(1999), 553 - 576
is available (postscript form).