%0 Journal Article %A van Kieu, Pham %T A diffusion approximation in the ruin problem for a controlled Markov chain %J Kybernetika %D 1974 %P -132 %V 10 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/KYB_1974__10_2_a3/ %G en %F KYB_1974__10_2_a3