@article{GDZPPN00205583X,
title = {Note on a basis of P. hall for the higher commutators in free groups.},
journal = {Commentarii mathematici Helvetici},
volume = {26},
year = {1952},
pages = {1-5},
zbl = {0046.02201},
url = {http://dml.mathdoc.fr/item/GDZPPN00205583X}
}
Meier-Wunderli, H. Note on a basis of P. hall for the higher commutators in free groups.. Commentarii mathematici Helvetici, Tome 26 (1952) pp. 1-5. http://gdmltest.u-ga.fr/item/GDZPPN00205583X/