TY  - JOUR
AU  - Bullejos, Manuel
AU  - Cegarra, Antonio M.
TI  - A 3-Dimensional Non-Abelian Cohomology of Groups With Applications to Homotopy Classification of Continuous Maps
JO  - Canadian journal of mathematics
PY  - 1991
SP  - 265
EP  - 296
VL  - 43
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1991-015-7/
DO  - 10.4153/CJM-1991-015-7
ID  - 10_4153_CJM_1991_015_7
ER  -