%0 Journal Article %A B. A. Sevast'yanov %T Sojourn times in a finite set of states of Markov branching processes and the probabilities of extinction of a modified Galton--Watson process %J Diskretnaya Matematika %D 2000 %P 39-45 %V 12 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DM_2000_12_4_a2/ %G ru %F DM_2000_12_4_a2