Literature cited
L. Collatz, Eigenvalue Problems [Russian translation], Mir, Moscow (1968).
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Translated from Issledovaniya po Prikladnoi Matematike, No. 16, pp. 131–138, 1989.
In conclusion note that these assumptions hold for many boundary-value problems for differential equations with a deviating argument and for partial differential equations.
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Sidorov, A.M. Eigenvalues and eigenvectors of a perturbed operator. J Math Sci 61, 2476–2480 (1992). https://doi.org/10.1007/BF01100586
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DOI: https://doi.org/10.1007/BF01100586