@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/