Geodesic
The spectrum of contractions that depend analytically on a parameter
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 29 (1974) no. 6 
G. M. Feldman. The spectrum of contractions that depend analytically on a parameter. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 29 (1974) no. 6. http://geodesic.mathdoc.fr/item/RM_1974_29_6_a17/
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     author = {G. M. Feldman},
     title = {The spectrum of contractions that depend analytically on a~parameter},
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     year = {1974},
     volume = {29},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1974_29_6_a17/}
}
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[1] L. I. Ronkin, Vvedenie v teoriyu tselykh funktsii mnogikh peremennykh, «Nauka», M., 1971 | MR | Zbl

[2] N. Danford, Dzh. Shvarts, Lineinye operatory, IL, M., 1962