@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/}
}