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@article{AM2_1989__38_1_137317, author = {J. R\"atz and Gy. Szab\'o}, title = {On orthogonally additive mappings, {IV.}}, journal = {Aequationes mathematicae}, pages = {73--85}, publisher = {mathdoc}, volume = {38}, number = {1}, year = {1989}, zbl = {0679.39005}, url = {http://geodesic.mathdoc.fr/item/AM2_1989__38_1_137317/} }
J. Rätz; Gy. Szabó. On orthogonally additive mappings, IV.. Aequationes mathematicae, Tome 38 (1989) no. 1, pp. 73-85. http://geodesic.mathdoc.fr/item/AM2_1989__38_1_137317/