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Translated from Matematicheskie Zametki, Vol. 30, No. 3, pp. 371–385, September, 1981.
In conclusion, the author thanks A. G. Kostyuchenko and G. V. Radzievskii for discussions regarding the present note.
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Shkalikov, A.A. Property of the eigenvectors of quadratic operator pencils of being a basis. Mathematical Notes of the Academy of Sciences of the USSR 30, 676–684 (1981). https://doi.org/10.1007/BF01141624
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DOI: https://doi.org/10.1007/BF01141624