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@article{MAN_1976__221_162829, author = {R. Daniel Hurwitz}, title = {On the {Conjugacy} {Problem} in a {Free} {Product} with {Commuting} {Subgroups.}}, journal = {Mathematische Annalen}, pages = {1--8}, publisher = {mathdoc}, volume = {221}, year = {1976}, zbl = {0308.20027}, url = {http://geodesic.mathdoc.fr/item/MAN_1976__221_162829/} }
R. Daniel Hurwitz. On the Conjugacy Problem in a Free Product with Commuting Subgroups.. Mathematische Annalen, Tome 221 (1976), pp. 1-8. http://geodesic.mathdoc.fr/item/MAN_1976__221_162829/