@article{GDZPPN002403943, title = {On Finitely Generated Subgroups of a Free Product.}, journal = {Mathematische Zeitschrift}, volume = {105}, year = {1968}, pages = {285-287}, zbl = {0182.03601}, url = {http://dml.mathdoc.fr/item/GDZPPN002403943} }
Karrass, Abraham; Solitar, Donald. On Finitely Generated Subgroups of a Free Product.. Mathematische Zeitschrift, Tome 105 (1968) pp. 285-287. http://gdmltest.u-ga.fr/item/GDZPPN002403943/