TY - JOUR AU - Jolanta SocaƂa TI - On the existence of invariant densities for Markov operators JO - Annales Polonici Mathematici PY - 1988 SP - 51 EP - 56 VL - 48 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/ap-48-1-51-56/ DO - 10.4064/ap-48-1-51-56 LA - en ID - 10_4064_ap_48_1_51_56 ER -