@article{1077469692,
author = {Bellman, Richard and Lehman, R. Sherman},
title = {Functional equations in the theory of dynamic programming---XII: Complex operators and min-max variation},
journal = {Duke Math. J.},
volume = {28},
number = {1},
year = {1961},
pages = { 335-343},
language = {en},
url = {http://dml.mathdoc.fr/item/1077469692}
}
Bellman, Richard; Lehman, R. Sherman. Functional equations in the theory of dynamic programming—XII: Complex operators and min-max variation. Duke Math. J., Tome 28 (1961) no. 1, pp. 335-343. http://gdmltest.u-ga.fr/item/1077469692/