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@article{AM2_1987__34_137222, author = {Walter Benz and Hubert Berens}, title = {A contribution to a theorem of {Ulam} and {Mazur.}}, journal = {Aequationes mathematicae}, pages = {61--63}, publisher = {mathdoc}, volume = {34}, year = {1987}, zbl = {0651.46022}, url = {http://geodesic.mathdoc.fr/item/AM2_1987__34_137222/} }
Walter Benz; Hubert Berens. A contribution to a theorem of Ulam and Mazur.. Aequationes mathematicae, Tome 34 (1987), pp. 61-63. http://geodesic.mathdoc.fr/item/AM2_1987__34_137222/