@article{MZ_1967__96_170676,
     author = {Paul C. Shields},
     title = {Invariant {Elements} for {Positive} {Contractions} on a {Banach} {Lattice.}},
     journal = {Mathematische Zeitschrift},
     pages = {189--195},
     publisher = {mathdoc},
     volume = {96},
     year = {1967},
     zbl = {0147.34101},
     url = {http://geodesic.mathdoc.fr/item/MZ_1967__96_170676/}
}