%0 Journal Article %A A. D. Solov'ev %T A combinatorial identity and its application to the problem about the first occurence of a rare event %J Teoriâ veroâtnostej i ee primeneniâ %D 1966 %P 313-320 %V 11 %N 2 %U http://geodesic.mathdoc.fr/item/TVP_1966_11_2_a5/ %G ru %F TVP_1966_11_2_a5