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Additional information
Computing Center, Siberian Branch of the Academy of Sciences of the USSR. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 2, No. 2, pp. 81–85, April–June, 1968.
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Shishatskii, S.P. The correctness of boundary problems for a second-order differential equation with a self-adjoint negative operator in a Hilbert space. Funct Anal Its Appl 2, 169–173 (1968). https://doi.org/10.1007/BF01075951
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DOI: https://doi.org/10.1007/BF01075951