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Translated from Matematicheskie Zametki, Vol. 36, No. 3, pp. 305–308, September, 1984.
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Beznoshchenko, N.Y. Nonuniqueness of the solution of the problem of determining the coefficients of the leading terms of equations in partial derivatives. Mathematical Notes of the Academy of Sciences of the USSR 36, 647–649 (1984). https://doi.org/10.1007/BF01141933
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DOI: https://doi.org/10.1007/BF01141933