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Additional information
Joint Institute for Nuclear Research, Dubna. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 21, No. 3, pp. 98–109, May–June, 1980.
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Kirchev, K.P., Khristov, E.K. Expansions associated with products of solutions of two regular Sturm-Liouville problems. Sib Math J 21, 389–398 (1980). https://doi.org/10.1007/BF00968183
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DOI: https://doi.org/10.1007/BF00968183