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@article{AM2_1982__25_136946, author = {A. J\'arai}, title = {Regularity properties of functional equations.}, journal = {Aequationes mathematicae}, pages = {52--66}, publisher = {mathdoc}, volume = {25}, year = {1982}, zbl = {0517.39009}, url = {http://geodesic.mathdoc.fr/item/AM2_1982__25_136946/} }
A. Járai. Regularity properties of functional equations.. Aequationes mathematicae, Tome 25 (1982), pp. 52-66. http://geodesic.mathdoc.fr/item/AM2_1982__25_136946/