@article{GDZPPN002426102,
title = {One-Relator Groups and the Lower Central Series. II. Invariants of One-Relator Groups.},
journal = {Mathematische Zeitschrift},
volume = {180},
year = {1982},
pages = {359-368},
zbl = {0465.20028},
url = {http://dml.mathdoc.fr/item/GDZPPN002426102}
}
Horadam, Kathryn J. One-Relator Groups and the Lower Central Series. II. Invariants of One-Relator Groups.. Mathematische Zeitschrift, Tome 180 (1982) pp. 359-368. http://gdmltest.u-ga.fr/item/GDZPPN002426102/