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@article{MZ_1970__117_171430, author = {Hanna Neumann and I.M.S. Dey}, title = {The {Hopf} {Property} of {Free} {Products.}}, journal = {Mathematische Zeitschrift}, pages = {325--339}, publisher = {mathdoc}, volume = {117}, year = {1970}, zbl = {0204.34205}, url = {http://geodesic.mathdoc.fr/item/MZ_1970__117_171430/} }
Hanna Neumann; I.M.S. Dey. The Hopf Property of Free Products.. Mathematische Zeitschrift, Tome 117 (1970), pp. 325-339. http://geodesic.mathdoc.fr/item/MZ_1970__117_171430/