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@article{AM2_1981__22_136853, author = {E.T. Ljubenova}, title = {On {D'Alembert's} functional equation on a {Abelian} group.}, journal = {Aequationes mathematicae}, pages = {54--55}, publisher = {mathdoc}, volume = {22}, year = {1981}, language = {en}, url = {http://geodesic.mathdoc.fr/item/AM2_1981__22_136853/} }
E.T. Ljubenova. On D'Alembert's functional equation on a Abelian group.. Aequationes mathematicae, Tome 22 (1981), pp. 54-55. http://geodesic.mathdoc.fr/item/AM2_1981__22_136853/