%0 Journal Article %A Jolanta SocaƂa %T On the existence of invariant densities for Markov operators %J Annales Polonici Mathematici %D 1988 %P 51-56 %V 48 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-48-1-51-56/ %R 10.4064/ap-48-1-51-56 %G en %F 10_4064_ap_48_1_51_56