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Literature cited
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Translated from Matematicheskie Zametki, Vol. 36, No. 3, pp. 369–375, September, 1984.
The author thanks S. B. Stechkin for the formulation of the problem and assistance with the note and also V. V. Arestov for useful discussions.
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Timoshin, O.A. Best approximation of the operator of second mixed derivative in the metrics of L and C on the plane. Mathematical Notes of the Academy of Sciences of the USSR 36, 683–686 (1984). https://doi.org/10.1007/BF01141940
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DOI: https://doi.org/10.1007/BF01141940