TY  - JOUR
AU  - Bärbel Wicha-Krause
TI  - On Embedded 2-Spheres in 3-Manifolds.
JO  - Mathematische Zeitschrift
PY  - 1983
SP  - 235
EP  - 244
VL  - 184
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZ_1983__184_173359/
ID  - MZ_1983__184_173359
ER  -