TY  - JOUR
AU  - S. V. Buyalo
TI  - Homotopy invariance of some geometric properties of three-dimensional manifolds of nonpositive curvature
JO  - Algebra i analiz
PY  - 1991
SP  - 93
EP  - 112
VL  - 3
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AA_1991_3_4_a2/
LA  - ru
ID  - AA_1991_3_4_a2
ER  -