@article{10_4064_ap_48_1_51_56,
     author = {Jolanta Soca{\l}a},
     title = {On the existence of invariant densities for {Markov} operators},
     journal = {Annales Polonici Mathematici},
     pages = {51--56},
     publisher = {mathdoc},
     volume = {48},
     number = {1},
     year = {1988},
     doi = {10.4064/ap-48-1-51-56},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-48-1-51-56/}
}