@article{GDZPPN002549956,
title = {Belman's functional equation generalized I. (Short Communication).},
journal = {Aequationes mathematicae},
volume = {20},
year = {1980},
pages = {113-114},
url = {http://dml.mathdoc.fr/item/GDZPPN002549956}
}
Kardos, Peter. Belman's functional equation generalized I. (Short Communication).. Aequationes mathematicae, Tome 20 (1980) pp. 113-114. http://gdmltest.u-ga.fr/item/GDZPPN002549956/