@article{RLIN_1990_9_1_2_a7,
     author = {Arcoya, David and Calahorrano, Marco},
     title = {Multivalued nonpositone problems},
     journal = {Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni},
     pages = {117--123},
     publisher = {mathdoc},
     volume = {Ser. 9, 1},
     number = {2},
     year = {1990},
     zbl = {0719.35024},
     mrnumber = {1001862},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RLIN_1990_9_1_2_a7/}
}