%0 Journal Article %A È. Yu. Emel'yanov %T Regularity Conditions for Markov Semigroups on Abstract $L^1$-Spaces %J Matematičeskie trudy %D 2004 %P 50-82 %V 7 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MT_2004_7_1_a2/ %G ru %F MT_2004_7_1_a2