@article{JRAM_1985__358_152727,
     author = {Luis Ribes and Wolfgang Herfort},
     title = {Torsion elements and centralizers in free products of profinite groups.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {155--161},
     publisher = {mathdoc},
     volume = {358},
     year = {1985},
     zbl = {0549.20017},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1985__358_152727/}
}