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@article{MZ_1962__78_170006, author = {Gilbert Baumslag}, title = {On abelian hopfian groups. {I.}}, journal = {Mathematische Zeitschrift}, pages = {53--54}, publisher = {mathdoc}, volume = {78}, year = {1962}, zbl = {0104.02503}, url = {http://geodesic.mathdoc.fr/item/MZ_1962__78_170006/} }
Gilbert Baumslag. On abelian hopfian groups. I.. Mathematische Zeitschrift, Tome 78 (1962), pp. 53-54. http://geodesic.mathdoc.fr/item/MZ_1962__78_170006/