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Translated from Maternaticheskie Zametki, Vol. 25, No. 3, pp. 409–418, March, 1979.
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Otelbaev, M. Estimates of s-numbers and completeness conditions for systems of root vectors of non-self-adjoint Sturm-Liouville operators. Mathematical Notes of the Academy of Sciences of the USSR 25, 216–221 (1979). https://doi.org/10.1007/BF01159514
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DOI: https://doi.org/10.1007/BF01159514