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@article{AM2_1986__30_137112, author = {Pavel Kostyrko}, title = {On a local form of {Jensen's} functional equation.}, journal = {Aequationes mathematicae}, pages = {65--69}, publisher = {mathdoc}, volume = {30}, year = {1986}, zbl = {0594.39006}, url = {http://geodesic.mathdoc.fr/item/AM2_1986__30_137112/} }
Pavel Kostyrko. On a local form of Jensen's functional equation.. Aequationes mathematicae, Tome 30 (1986), pp. 65-69. http://geodesic.mathdoc.fr/item/AM2_1986__30_137112/