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@article{SF_1992__45_3_135200, author = {G. Duchamp and D. Krob}, title = {The lower central series of the free partially commutative group.}, journal = {Semigroup forum}, pages = {385--394}, publisher = {mathdoc}, volume = {45}, number = {3}, year = {1992}, zbl = {0814.20025}, url = {http://geodesic.mathdoc.fr/item/SF_1992__45_3_135200/} }
G. Duchamp; D. Krob. The lower central series of the free partially commutative group.. Semigroup forum, Tome 45 (1992) no. 3, pp. 385-394. http://geodesic.mathdoc.fr/item/SF_1992__45_3_135200/