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@article{AM2_1980__20_182385, author = {Peter Kardos}, title = {Belman's functional equation generalized {I.} {(Short} {Communication).}}, journal = {Aequationes mathematicae}, pages = {113--114}, publisher = {mathdoc}, volume = {20}, year = {1980}, url = {http://geodesic.mathdoc.fr/item/AM2_1980__20_182385/} }
Peter Kardos. Belman's functional equation generalized I. (Short Communication).. Aequationes mathematicae, Tome 20 (1980), pp. 113-114. http://geodesic.mathdoc.fr/item/AM2_1980__20_182385/