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@article{AM2_1985__29_137087, author = {Wolfgang Sander}, title = {About solutions of a functional equation.}, journal = {Aequationes mathematicae}, pages = {135--144}, publisher = {mathdoc}, volume = {29}, year = {1985}, zbl = {0588.39007}, url = {http://geodesic.mathdoc.fr/item/AM2_1985__29_137087/} }
Wolfgang Sander. About solutions of a functional equation.. Aequationes mathematicae, Tome 29 (1985), pp. 135-144. http://geodesic.mathdoc.fr/item/AM2_1985__29_137087/