Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{JRAM_1970__242_151014, author = {Frank Levin}, title = {On the laws of free nilpotent groups.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {108--114}, publisher = {mathdoc}, volume = {242}, year = {1970}, zbl = {0197.29803}, url = {http://geodesic.mathdoc.fr/item/JRAM_1970__242_151014/} }
Frank Levin. On the laws of free nilpotent groups.. Journal für die reine und angewandte Mathematik, Tome 242 (1970), pp. 108-114. http://geodesic.mathdoc.fr/item/JRAM_1970__242_151014/