%0 Journal Article %A Wojciech Bartoszek %T "Zero-two'' law for conservative Markov operators %J Colloquium Mathematicum %D 1987 %P 99-103 %V 52 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-52-1-99-103/ %R 10.4064/cm-52-1-99-103 %G en %F 10_4064_cm_52_1_99_103