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@article{AM2_1980__21_182433, author = {Peter Kardos}, title = {A generalization of {Bellman's} functional equation.}, journal = {Aequationes mathematicae}, pages = {236--245}, publisher = {mathdoc}, volume = {21}, year = {1980}, zbl = {0467.39003}, url = {http://geodesic.mathdoc.fr/item/AM2_1980__21_182433/} }
Peter Kardos. A generalization of Bellman's functional equation.. Aequationes mathematicae, Tome 21 (1980), pp. 236-245. http://geodesic.mathdoc.fr/item/AM2_1980__21_182433/