@article{GDZPPN002040050,
title = {On two conditional forms of the equation ||f(x + y)|| = ||f(x) + f(y)||.},
journal = {Aequationes mathematicae},
volume = {45},
year = {1993},
pages = {167-178},
zbl = {0776.39003},
url = {http://dml.mathdoc.fr/item/GDZPPN002040050}
}
Skof, Fulvia. On two conditional forms of the equation ||f(x + y)|| = ||f(x) + f(y)||.. Aequationes mathematicae, Tome 45 (1993) pp. 167-178. http://gdmltest.u-ga.fr/item/GDZPPN002040050/