@article{GDZPPN00220245X,
title = {Torsion elements and centralizers in free products of profinite groups.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {358},
year = {1985},
pages = {155-161},
zbl = {0549.20017},
url = {http://dml.mathdoc.fr/item/GDZPPN00220245X}
}
Ribes, Luis; Herfort, Wolfgang. Torsion elements and centralizers in free products of profinite groups.. Journal für die reine und angewandte Mathematik, Tome 358 (1985) pp. 155-161. http://gdmltest.u-ga.fr/item/GDZPPN00220245X/