@article{GDZPPN00218480X,
title = {On the laws of free nilpotent groups.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {244},
year = {1970},
pages = {108-114},
zbl = {0197.29803},
url = {http://dml.mathdoc.fr/item/GDZPPN00218480X}
}
Levin, Frank. On the laws of free nilpotent groups.. Journal für die reine und angewandte Mathematik, Tome 244 (1970) pp. 108-114. http://gdmltest.u-ga.fr/item/GDZPPN00218480X/