TY  - JOUR
AU  - Schafer, James A.
TI  - Representing Homology Classes on Surfaces
JO  - Canadian mathematical bulletin
PY  - 1976
SP  - 373
EP  - 374
VL  - 19
IS  - 3
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1976-058-4/
DO  - 10.4153/CMB-1976-058-4
ID  - 10_4153_CMB_1976_058_4
ER  -