Zapryanova, Teodora Dimova .
A Characterization of the K-functional for the Algebraic Version of the Trigonometric Jackson Integrals G s,n in Weighted Integral Metric.
Melville, NY: AIP [American Institute of Physics] Publ., 2013, pp. 423 - 429 (AIP Conf. Proc., 1570), ISBN 978-07354-1198-2.