TY  - JOUR
AU  - John Milnor
TI  - On the existence of a connection with curvature zero.
JO  - Commentarii mathematici Helvetici
PY  - 1957
SP  - 215
EP  - 223
VL  - 32
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMH_1957__32_139154/
ID  - CMH_1957__32_139154
ER  -