References
V. F. Dem’yanov and V. N. Malozemov, Introduction to Minimax (Nauka, Moscow, 1972) [in Russian].
N. I. Akhiezer, Lectures in the Theory of Approximation (Ungar, New York, 1956; Nauka, Moscow, 1965).
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Original Russian Text © V.I. Berdyshev, 2009, published in Doklady Akademii Nauk, 2009, Vol. 424, No. 5, pp. 588–590.
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Berdyshev, V.I. Visibility characteristic of a moving point. Dokl. Math. 79, 94–96 (2009). https://doi.org/10.1134/S1064562409010281
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DOI: https://doi.org/10.1134/S1064562409010281