@article{10_4153_CJM_1984_006_4,
     author = {Allegretto, Walter},
     title = {Nonnegative {Solutions} for {Weakly} {Nonlinear} {Elliptic} {Equations}},
     journal = {Canadian journal of mathematics},
     pages = {71--83},
     year = {1984},
     volume = {36},
     number = {1},
     doi = {10.4153/CJM-1984-006-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1984-006-4/}
}