@article{MAN_1984__268_182918,
     author = {Takasi Kusano and Hiroyuki Usami},
     title = {Positive {Solutions} of a {Class} of {Second} {Order} {Semilinear} {Elliptic} {Equations} in the {Plane.}},
     journal = {Mathematische Annalen},
     pages = {255--264},
     publisher = {mathdoc},
     volume = {268},
     year = {1984},
     zbl = {0522.35040},
     url = {http://geodesic.mathdoc.fr/item/MAN_1984__268_182918/}
}