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Additional information
Translated from Issledovaniya po Prikladnoi Matematike, No. 17, pp. 114–120, 1990.
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Sidorov, A.M. Spectral pairs of linear problems for functional-differential equations. J Math Sci 71, 2796–2798 (1994). https://doi.org/10.1007/BF02110587
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DOI: https://doi.org/10.1007/BF02110587