@article{PPN266833020_0197+dmdlog13,
title = {On the Nielsen Method in Free Products with Amalgamated Subgroups.},
journal = {Mathematische Zeitschrift},
volume = {199},
year = {1988},
pages = {97-118},
zbl = {0617.20011},
url = {http://dml.mathdoc.fr/item/PPN266833020_0197+dmdlog13}
}
Zieschang, Heiner; Collins, Donald J. On the Nielsen Method in Free Products with Amalgamated Subgroups.. Mathematische Zeitschrift, Tome 199 (1988) pp. 97-118. http://gdmltest.u-ga.fr/item/PPN266833020_0197+dmdlog13/