%0 Journal Article
%A Frans Oort
%T Newton polygons and formal groups: Conjectures by Manin and Grothendieck
%J Annals of mathematics
%D 2000
%V 152
%N 1
%U http://geodesic.mathdoc.fr/articles/10.2307/2661381/
%R 10.2307/2661381
%F 10_2307_2661381