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Translated from Matematicheskie Zametki, Vol. 50, No. 2, pp. 14–19, August, 1991.
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Bernik, V.I., Kovalevskaya, É.I. Two-dimensional extremal surfaces with jointly extremal partial derivatives. Mathematical Notes of the Academy of Sciences of the USSR 50, 779–783 (1991). https://doi.org/10.1007/BF01157561
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DOI: https://doi.org/10.1007/BF01157561