TY  - JOUR
AU  - Frans Oort
TI  - Newton polygons and formal groups: Conjectures by Manin and Grothendieck
JO  - Annals of mathematics
PY  - 2000
VL  - 152
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.2307/2661381/
DO  - 10.2307/2661381
ID  - 10_2307_2661381
ER  -