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Translated from Matematicheskie Zametki, Vol. 37, No. 2, pp. 237–248, February, 1985.
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Babenko, I.K. Zeros of the Sturm-Liouville equation with periodic potential. Mathematical Notes of the Academy of Sciences of the USSR 37, 135–141 (1985). https://doi.org/10.1007/BF01156758
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DOI: https://doi.org/10.1007/BF01156758