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Translated from Matematicheskie Zametki, Vol. 50, No. 1, pp. 131–138, July, 1991.
In conclusion, the author wishes to thank A. A. Shkalikov for his interest in my work.
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Shuster, L.A. A priori estimates of solutions of the Sturm-Liouville equation and the A. M. Molchanov criterion. Mathematical Notes of the Academy of Sciences of the USSR 50, 746–751 (1991). https://doi.org/10.1007/BF01156613