@article{ASNSP_1987_4_14_1_97_0,
     author = {Cl\'ement, Philippe and Sweers, Guido},
     title = {Existence and multiplicity results for a semilinear elliptic eigenvalue problem},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {97--121},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 14},
     number = {1},
     year = {1987},
     mrnumber = {937538},
     zbl = {0662.35045},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1987_4_14_1_97_0/}
}