TY  - JOUR
AU  - Vagn Lundsgaard Hansen
TI  - On the Space of Maps of a Closed Surface into the 2-Sphere.
JO  - Mathematica Scandinavica
PY  - 1974
SP  - 149
EP  - 158
VL  - 35
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MS2_1974__35_166381/
ID  - MS2_1974__35_166381
ER  -