TY  - JOUR
AU  - V. G. Boltyanskii
TI  - Basic concepts of homology and obstruction theory
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1966
SP  - 113
EP  - 132
VL  - 21
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_1966_21_5_a2/
LA  - en
ID  - RM_1966_21_5_a2
ER  -