%0 Journal Article %A Mandl, Petr %T On the variance in controlled Markov chains %J Kybernetika %D 1971 %P -12 %V 07 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/KYB_1971__7_1_a0/ %G en %F KYB_1971__7_1_a0