Basic theory of Fredholm operators
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 21 (1967) no. 2, pp. 261-280. 
@article{ASNSP_1967_3_21_2_261_0,
     author = {Schechter, Martin},
     title = {Basic theory of {Fredholm} operators},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {261--280},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 21},
     number = {2},
     year = {1967},
     mrnumber = {223930},
     zbl = {0145.39105},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1967_3_21_2_261_0/}
}
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Schechter, Martin. Basic theory of Fredholm operators. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 21 (1967) no. 2, pp. 261-280. http://archive.numdam.org/item/ASNSP_1967_3_21_2_261_0/

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