References
Tomić, M.: Über trigonometrische Sinus-Reihen mit positiven Koeffizienten. Math. Z.75, 53–56 (1961).
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Work supported by National Science Foundation grant G 14876.
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Boas, R.P. On sine series with positive coefficients. Math Z 80, 382–383 (1962). https://doi.org/10.1007/BF01162395
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DOI: https://doi.org/10.1007/BF01162395