TY  - JOUR
AU  - S. V. Buyalo
TI  - Metrics of nonpositive curvature on graph-manifolds and electromagnetic fields on graphs
JO  - Zapiski Nauchnykh Seminarov POMI
PY  - 2001
SP  - 28
EP  - 72
VL  - 280
UR  - http://geodesic.mathdoc.fr/item/ZNSL_2001_280_a3/
LA  - ru
ID  - ZNSL_2001_280_a3
ER  -