Akhazhanov, T.B., Bokayev N.А., Matin, D.T., & Aktosun, T. (2023). Coefficients of multiple Fourier-Haar series and variational modulus of continuity: An Erratum to this article was published in issue 1(113) dated March 29, 2024. Bulletin of the Karaganda University. Mathematics Series, 4(112), 21–29. https://doi.org/10.31489/2023m4/21-29