@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/