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Translated from Matematicheskie Zametki, Vol. 47, No. 1, pp. 15–28, January, 1990.
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Arestov, V.V., Kondrat'ev, V.P. Certain extremal problem for nonnegative trigonometric polynomials. Mathematical Notes of the Academy of Sciences of the USSR 47, 10–20 (1990). https://doi.org/10.1007/BF01157278
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DOI: https://doi.org/10.1007/BF01157278