@article{GDZPPN002394731,
title = {Schreier varieties of groups.},
journal = {Mathematische Zeitschrift},
volume = {85},
year = {1964},
pages = {392-400},
zbl = {0126.26901},
url = {http://dml.mathdoc.fr/item/GDZPPN002394731}
}
Wiegold, James; Neumann, Peter M. Schreier varieties of groups.. Mathematische Zeitschrift, Tome 85 (1964) pp. 392-400. http://gdmltest.u-ga.fr/item/GDZPPN002394731/