TY  - JOUR
AU  - Richard Tondra
TI  - Homeotopy groups of surfaces whose boundary is the union of 1-spheres
JO  - Fundamenta Mathematicae
PY  - 1979
SP  - 79
EP  - 85
VL  - 105
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/fm-105-2-79-85/
DO  - 10.4064/fm-105-2-79-85
LA  - en
ID  - 10_4064_fm_105_2_79_85
ER  -