%0 Journal Article %A Castillo, Jesús M.F. %T Factorization of entropy ideals: proportional case %J Portugaliae mathematica %D 1991 %P 11-23 %V 48 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_1991__48_1_115737/ %G en %F PORMA_1991__48_1_115737