@article{10_4153_CJM_1989_039_8,
     author = {G\'ora, P. and Boyarsky, A.},
     title = {Compactness of {Invariant} {Densities} for {Families} of {Expanding,} {Piecewise} {Monotonic} {Transformations}},
     journal = {Canadian journal of mathematics},
     pages = {855--869},
     year = {1989},
     volume = {41},
     number = {5},
     doi = {10.4153/CJM-1989-039-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1989-039-8/}
}