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Translated from Matematicheskie Zametki, Vol. 46, No. 2, pp. 21–33, August, 1989.
The author thanks S. V. Konyagin, N. I. Chernykh, and I. G. Tsar'kov for helpful discussions.
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Babaev, M.B.A. Best approximation by bilinear forms. Mathematical Notes of the Academy of Sciences of the USSR 46, 588–596 (1989). https://doi.org/10.1007/BF01137621
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DOI: https://doi.org/10.1007/BF01137621