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@article{AM2_1993__45_2-3_137519, author = {Fulvia Skof}, title = {On two conditional forms of the equation ||f(x + y)|| = ||f(x) + f(y)||.}, journal = {Aequationes mathematicae}, pages = {167--178}, publisher = {mathdoc}, volume = {45}, number = {2-3}, year = {1993}, zbl = {0776.39003}, url = {http://geodesic.mathdoc.fr/item/AM2_1993__45_2-3_137519/} }
Fulvia Skof. On two conditional forms of the equation ||f(x + y)|| = ||f(x) + f(y)||.. Aequationes mathematicae, Tome 45 (1993) no. 2-3, pp. 167-178. http://geodesic.mathdoc.fr/item/AM2_1993__45_2-3_137519/