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Additional information
Moscow Physicotechnical Institute. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 6, No. 3, pp. 74–76, July–September, 1972.
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Kalyabin, G.A. On the number of solutions of a self-adjoint system of second-order differential equations in L2(0, ∞). Funct Anal Its Appl 6, 237–239 (1972). https://doi.org/10.1007/BF01077885
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DOI: https://doi.org/10.1007/BF01077885