@article{GDZPPN002550628,
title = {On two conditional forms of the equation ||f(x + y)|| = ||f(x) + f(y)||. (Summary).},
journal = {Aequationes mathematicae},
volume = {45},
year = {1993},
pages = {122-122},
zbl = {0776.39003},
url = {http://dml.mathdoc.fr/item/GDZPPN002550628}
}
Skof, Fulvia. On two conditional forms of the equation ||f(x + y)|| = ||f(x) + f(y)||. (Summary).. Aequationes mathematicae, Tome 45 (1993) p. 122. http://gdmltest.u-ga.fr/item/GDZPPN002550628/