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@article{MZ_1959__71_169817, author = {P.M. Cohn}, title = {On the {Free} {Product} of {Associative} {Rings.}}, journal = {Mathematische Zeitschrift}, pages = {380--398}, publisher = {mathdoc}, volume = {71}, year = {1959}, zbl = {0087.26303}, url = {http://geodesic.mathdoc.fr/item/MZ_1959__71_169817/} }
P.M. Cohn. On the Free Product of Associative Rings.. Mathematische Zeitschrift, Tome 71 (1959), pp. 380-398. http://geodesic.mathdoc.fr/item/MZ_1959__71_169817/