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@article{AM2_1989__38_1_137316, author = {Gy. Petruska}, title = {On a functional equation with retarded mean.}, journal = {Aequationes mathematicae}, pages = {66--72}, publisher = {mathdoc}, volume = {38}, number = {1}, year = {1989}, zbl = {0679.39007}, url = {http://geodesic.mathdoc.fr/item/AM2_1989__38_1_137316/} }
Gy. Petruska. On a functional equation with retarded mean.. Aequationes mathematicae, Tome 38 (1989) no. 1, pp. 66-72. http://geodesic.mathdoc.fr/item/AM2_1989__38_1_137316/