Geodesic
Estimate for the least positive root of the harmonic function in a circle decomposed into sine series
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 3 (2023), pp. 15-23

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The problem of finding the smallest positive zero of a sine series of a harmonic function in a circle, represented on the boundary of the circle as a series with monotone coefficients, is solved. 
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     author = {T. Yu. Semenova},
     title = {Estimate for the least positive root of the harmonic function in a circle decomposed into sine series},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
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T. Yu. Semenova. Estimate for the least positive root of the harmonic function in a circle decomposed into sine series. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 3 (2023), pp. 15-23. http://geodesic.mathdoc.fr/item/VMUMM_2023_3_a2/