TY  - JOUR
AU  - Cegarra, A. M.
AU  - Garćia-Calcines, J. M.
AU  - Ortega, J. A.
TI  - On Graded Categorical Groups and Equivariant Group Extensions
JO  - Canadian journal of mathematics
PY  - 2002
SP  - 970
EP  - 997
VL  - 54
IS  - 5
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-2002-036-1/
DO  - 10.4153/CJM-2002-036-1
ID  - 10_4153_CJM_2002_036_1
ER  -