%0 Journal Article %A Yu. D. Burtin %A B. G. Pittel' %T Semi-Markovian decisions in a~problem of optimal checking procedure for an unreliable queuing systemt %J Teoriâ veroâtnostej i ee primeneniâ %D 1972 %P 496-517 %V 17 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/TVP_1972_17_3_a7/ %G ru %F TVP_1972_17_3_a7