%0 Journal Article %A M. Yu. Kitaev %T The existence of optimal stationary policies for semicontinuous semi-Markov decision models with respect to the average cost criterion %J Teoriâ veroâtnostej i ee primeneniâ %D 1981 %P 627-629 %V 26 %N 3 %U http://geodesic.mathdoc.fr/item/TVP_1981_26_3_a17/ %G ru %F TVP_1981_26_3_a17