Literature Cited
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Additional information
M. V. Lomonosov Moscow State University. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 22, No. 2, pp. 137–148, March–April, 1981.
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Levitan, B.M. Regularized traces and conditions for the smooth periodicity of the potential of the sturm — Liouville equation. Sib Math J 22, 273–283 (1981). https://doi.org/10.1007/BF00968423
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DOI: https://doi.org/10.1007/BF00968423