TY  - JOUR
AU  - L. Potyagailo
AU  - Sh. Wang
TI  - On the co-Hopficity of $3$-manifold groups
JO  - Algebra i analiz
PY  - 1999
SP  - 194
EP  - 220
VL  - 11
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AA_1999_11_5_a9/
LA  - ru
ID  - AA_1999_11_5_a9
ER  -