@article{1183531491,
author = {Ordman, Edward T.},
title = {Subgroups of amalgamated free products},
journal = {Bull. Amer. Math. Soc.},
volume = {76},
number = {4},
year = {1970},
pages = { 358-360},
language = {en},
url = {http://dml.mathdoc.fr/item/1183531491}
}
Ordman, Edward T. Subgroups of amalgamated free products. Bull. Amer. Math. Soc., Tome 76 (1970) no. 4, pp. 358-360. http://gdmltest.u-ga.fr/item/1183531491/