TY  - JOUR
AU  - Jong Lee
TI  - Homeotopy groups of orientable 2-manifolds
JO  - Fundamenta Mathematicae
PY  - 1972
SP  - 115
EP  - 124
VL  - 77
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/fm-77-2-115-124/
DO  - 10.4064/fm-77-2-115-124
LA  - en
ID  - 10_4064_fm_77_2_115_124
ER  -