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Original Russian Text © A. A. Belyaev, 2013, published in Matematicheskie Zametki, 2013, Vol. 94, No. 4, pp. 632–636.
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Belyaev, A.A. Sungular perturbations of powers of the laplacian on the torus. Math Notes 94, 594–598 (2013). https://doi.org/10.1134/S0001434613090307
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DOI: https://doi.org/10.1134/S0001434613090307