TY  - JOUR
AU  - S. V. Buyalo
AU  - V. L. Kobel'skii
TI  - Generalized graph-manifolds of nonpositive curvature
JO  - Algebra i analiz
PY  - 1999
SP  - 64
EP  - 87
VL  - 11
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AA_1999_11_2_a2/
LA  - ru
ID  - AA_1999_11_2_a2
ER  -