%0 Journal Article %A Cavazos-Cadena, Rolando %T Weak conditions for the existence of optimal stationary policies in average Markov decision chains with unbounded costs %J Kybernetika %D 1989 %P 145-156 %V 25 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/KYB_1989__25_3_a0/ %G en %F KYB_1989__25_3_a0