@article{GDZPPN001262157,
title = {The lower central series of the free partially commutative group.},
journal = {Semigroup forum},
volume = {44},
year = {1992},
pages = {385-394},
zbl = {0814.20025},
url = {http://dml.mathdoc.fr/item/GDZPPN001262157}
}
Duchamp, G.; Krob, D. The lower central series of the free partially commutative group.. Semigroup forum, Tome 44 (1992) pp. 385-394. http://gdmltest.u-ga.fr/item/GDZPPN001262157/