@article{AM2_1972__8_136308,
     author = {A. Lasota},
     title = {Invariant {Measures} and {Functional} {Equations.} {(Short} {Communications).}},
     journal = {Aequationes mathematicae},
     pages = {312--313},
     publisher = {mathdoc},
     volume = {8},
     year = {1972},
     url = {http://geodesic.mathdoc.fr/item/AM2_1972__8_136308/}
}