@article{PORMA_1985__43_1_114557,
     author = {Fujimoto, Takao and Herrero, Carmen and Villar, Ant\'onio},
     title = {Comparing solutions of equation systems involving semipositive operators},
     journal = {Portugaliae mathematica},
     pages = {131--137},
     publisher = {mathdoc},
     volume = {43},
     number = {1},
     year = {1985},
     mrnumber = {0875060},
     zbl = {0581.47039},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1985__43_1_114557/}
}