@article{JRAM_1960__203_150423, author = {Bernard M. Dwork}, title = {On the congruence properties of the zeta function of algebraic varieties.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {130--142}, publisher = {mathdoc}, volume = {203}, year = {1960}, zbl = {0119.36804}, url = {http://geodesic.mathdoc.fr/item/JRAM_1960__203_150423/} }