@article{PORMA_1991__48_1_115737,
     author = {Castillo, Jes\'us M.F.},
     title = {Factorization of entropy ideals: proportional case},
     journal = {Portugaliae mathematica},
     pages = {11--23},
     publisher = {mathdoc},
     volume = {48},
     number = {1},
     year = {1991},
     mrnumber = {1107255},
     zbl = {0736.47020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1991__48_1_115737/}
}