@article{GDZPPN00206152X,
title = {Commutators of Diffeomorphisms},
journal = {Commentarii mathematici Helvetici},
volume = {49},
year = {1974},
pages = {512-528},
zbl = {0289.57014},
url = {http://dml.mathdoc.fr/item/GDZPPN00206152X}
}
Mather, John N. Commutators of Diffeomorphisms. Commentarii mathematici Helvetici, Tome 49 (1974) pp. 512-528. http://gdmltest.u-ga.fr/item/GDZPPN00206152X/