@article{GDZPPN002032910, title = {On D'Alembert's functional equation on a Abelian group.}, journal = {Aequationes mathematicae}, volume = {22}, year = {1981}, pages = {54-55}, language = {en}, url = {http://dml.mathdoc.fr/item/GDZPPN002032910} }
Ljubenova, E.T. On D'Alembert's functional equation on a Abelian group.. Aequationes mathematicae, Tome 22 (1981) pp. 54-55. http://gdmltest.u-ga.fr/item/GDZPPN002032910/