no. 4
Variational theory of set-valued Hammerstein operators in Banach function spaces. The eigenvalue problem
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 5 (1978) no. 4, pp. 633-655. 
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     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/}
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Coffman, Charles V. Variational theory of set-valued Hammerstein operators in Banach function spaces. The eigenvalue problem. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 5 (1978) no. 4, pp. 633-655. http://www.numdam.org/item/ASNSP_1978_4_5_4_633_0/

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