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
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AM_2000_152_1_a3/
ID  - AM_2000_152_1_a3
ER  -