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@article{CMH_1952__26_139031, author = {H. Meier-Wunderli}, title = {Note on a basis of {P.} hall for the higher commutators in free groups.}, journal = {Commentarii mathematici Helvetici}, pages = {1--5}, publisher = {mathdoc}, volume = {26}, year = {1952}, zbl = {0046.02201}, url = {http://geodesic.mathdoc.fr/item/CMH_1952__26_139031/} }
H. Meier-Wunderli. Note on a basis of P. hall for the higher commutators in free groups.. Commentarii mathematici Helvetici, Tome 26 (1952), pp. 1-5. http://geodesic.mathdoc.fr/item/CMH_1952__26_139031/