TY  - JOUR
AU  - Beno Eckmann
AU  - Urs Stammbach
AU  - Peter J. Hilton
TI  - On the Homology Theory of Central Group Extensions: I - The Commutator Map and Stem Extensions
JO  - Commentarii mathematici Helvetici
PY  - 1972
SP  - 102
EP  - 122
VL  - 47
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMH_1972__47_139503/
ID  - CMH_1972__47_139503
ER  -