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@article{AM2_1992__43_1_137465, author = {Janusz Matkowski}, title = {Functional inequality characterizing nonnegative concave functions in (0, ?)k.}, journal = {Aequationes mathematicae}, pages = {219--224}, publisher = {mathdoc}, volume = {43}, number = {1}, year = {1992}, zbl = {0756.39017}, url = {http://geodesic.mathdoc.fr/item/AM2_1992__43_1_137465/} }
Janusz Matkowski. Functional inequality characterizing nonnegative concave functions in (0, ?)k.. Aequationes mathematicae, Tome 43 (1992) no. 1, pp. 219-224. http://geodesic.mathdoc.fr/item/AM2_1992__43_1_137465/