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Original Russian Text © N. I. Goloshchapova, V. P. Zastavnyi, M. M. Malamud, 2011, published in Matematicheskie Zametki, 2011, Vol. 90, No. 1, pp. 151–156.
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Goloshchapova, N.I., Zastavnyi, V.P. & Malamud, M.M. Positive definite functions and spectral properties of the Schrödinger operator with point interactions. Math Notes 90, 149 (2011). https://doi.org/10.1134/S0001434611070157
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DOI: https://doi.org/10.1134/S0001434611070157