TY  - JOUR
AU  - S. V. Buyalo
TI  - Three-dimensional manifolds of nonpositive curvature containing
JO  - Doklady Akademii Nauk
PY  - 1989
SP  - 1037
EP  - 1040
VL  - 307
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1989_307_5_a1/
LA  - ru
ID  - DAN_1989_307_5_a1
ER  -