TY  - JOUR
AU  - Robert Gulliver
TI  - Branched Immersions of Surfaces and Reduction of Topological Type. II.
JO  - Mathematische Annalen
PY  - 1977
SP  - 25
EP  - 48
VL  - 230
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MAN_1977__230_163027/
ID  - MAN_1977__230_163027
ER  -