%0 Journal Article %A V. A. Vatutin %A S. M. Sagitov %T A critical branching process: the remote past given a favorable present %J Teoriâ veroâtnostej i ee primeneniâ %D 1991 %P 3-15 %V 36 %N 1 %U http://geodesic.mathdoc.fr/item/TVP_1991_36_1_a0/ %G ru %F TVP_1991_36_1_a0