TY  - JOUR
AU  - John N. Mather
TI  - Commutators of diffeomorphisms, III: a group which is not perfect.
JO  - Commentarii mathematici Helvetici
PY  - 1985
SP  - 122
EP  - 124
VL  - 60
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMH_1985__60_140003/
ID  - CMH_1985__60_140003
ER  -