@article{GDZPPN00231262X,
title = {On the Conjugacy Problem in a Free Product with Commuting Subgroups.},
journal = {Mathematische Annalen},
volume = {219},
year = {1976},
pages = {1-8},
zbl = {0308.20027},
url = {http://dml.mathdoc.fr/item/GDZPPN00231262X}
}
Hurwitz, R. Daniel. On the Conjugacy Problem in a Free Product with Commuting Subgroups.. Mathematische Annalen, Tome 219 (1976) pp. 1-8. http://gdmltest.u-ga.fr/item/GDZPPN00231262X/