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@article{AM2_1985__28_137037, author = {J\"urg R\"atz}, title = {On orthogonally additive mappings.}, journal = {Aequationes mathematicae}, pages = {35--49}, publisher = {mathdoc}, volume = {28}, year = {1985}, zbl = {0569.39006}, url = {http://geodesic.mathdoc.fr/item/AM2_1985__28_137037/} }
Jürg Rätz. On orthogonally additive mappings.. Aequationes mathematicae, Tome 28 (1985), pp. 35-49. http://geodesic.mathdoc.fr/item/AM2_1985__28_137037/