@article{1077310226,
author = {Shapiro, Jack and Sonn, Jack},
title = {Free factor groups of one-relator groups},
journal = {Duke Math. J.},
volume = {41},
number = {1},
year = {1974},
pages = { 83-88},
language = {en},
url = {http://dml.mathdoc.fr/item/1077310226}
}
Shapiro, Jack; Sonn, Jack. Free factor groups of one-relator groups. Duke Math. J., Tome 41 (1974) no. 1, pp. 83-88. http://gdmltest.u-ga.fr/item/1077310226/