@article{ASNSP_1978_4_5_4_633_0,
     author = {Coffman, Charles V.},
     title = {Variational theory of set-valued {Hammerstein} operators in {Banach} function spaces. {The} eigenvalue problem},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {633--655},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 5},
     number = {4},
     year = {1978},
     mrnumber = {519887},
     zbl = {0391.45008},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1978_4_5_4_633_0/}
}