TY  - JOUR
AU  - R. V. Mikhailov
TI  - Asphericity and approximation properties of crossed modules
JO  - Sbornik. Mathematics
PY  - 2007
SP  - 521
EP  - 535
VL  - 198
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_2007_198_4_a3/
LA  - en
ID  - SM_2007_198_4_a3
ER  -