@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/}
}