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Translated from Matematicheskie Zametki, Vol. 57, No. 5, pp. 732–746, May 1995.
I would like to than V. E. Shatalov for numerous consultations, and B. Yu. Sternin for constant attention and support.
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Savina, T.V. On reflection formulas for higher-order elliptic equations. Math Notes 57, 511–521 (1995). https://doi.org/10.1007/BF02304421
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DOI: https://doi.org/10.1007/BF02304421