%0 Journal Article %A Paul C. Shields %T Invariant Elements for Positive Contractions on a Banach Lattice. %J Mathematische Zeitschrift %D 1967 %P 189-195 %V 96 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZ_1967__96_170676/ %F MZ_1967__96_170676