@article{MZ_1986__191_173690,
     author = {W. Allegretto},
     title = {On {Positive} {L?} {Solutions} of a {Class} of {Elliptic} {Systems.}},
     journal = {Mathematische Zeitschrift},
     pages = {479--484},
     publisher = {mathdoc},
     volume = {191},
     year = {1986},
     zbl = {0578.35023},
     url = {http://geodesic.mathdoc.fr/item/MZ_1986__191_173690/}
}