TY  - JOUR
AU  - John Baildon
TI  - Euler characteristics of 2-manifolds and light open maps
JO  - Fundamenta Mathematicae
PY  - 1975
SP  - 261
EP  - 268
VL  - 90
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/fm-90-3-261-268/
DO  - 10.4064/fm-90-3-261-268
LA  - en
ID  - 10_4064_fm_90_3_261_268
ER  -