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@article{AM2_1992__43_1_137444, author = {Ramon Badora}, title = {On a joint generalization of {Cauchy's} and {d'Alembert's} functional equations.}, journal = {Aequationes mathematicae}, pages = {72--89}, publisher = {mathdoc}, volume = {43}, number = {1}, year = {1992}, zbl = {0763.39003}, url = {http://geodesic.mathdoc.fr/item/AM2_1992__43_1_137444/} }
Ramon Badora. On a joint generalization of Cauchy's and d'Alembert's functional equations.. Aequationes mathematicae, Tome 43 (1992) no. 1, pp. 72-89. http://geodesic.mathdoc.fr/item/AM2_1992__43_1_137444/