TY - JOUR AU - È. Yu. Emel'yanov TI - Regularity Conditions for Markov Semigroups on Abstract $L^1$-Spaces JO - Matematičeskie trudy PY - 2004 SP - 50 EP - 82 VL - 7 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MT_2004_7_1_a2/ LA - ru ID - MT_2004_7_1_a2 ER -