Stepanets, O. I., Степанец, А. И., & Степанец, А. И. (1998). Approximation of $\bar {\psi} - \text{Integrals}$ of periodic functions by Fourier sums (small smoothness). IIof periodic functions by Fourier sums (small smoothness). II. Institute of Mathematics, NAS of Ukraine.
Chicago Style (17th ed.) CitationStepanets, O. I., А. И Степанец, and А. И Степанец. Approximation of $\bar {\psi} - \text{Integrals}$ of Periodic Functions by Fourier Sums (small Smoothness). IIof Periodic Functions by Fourier Sums (small Smoothness). II. Institute of Mathematics, NAS of Ukraine, 1998.
MLA (8th ed.) CitationStepanets, O. I., et al. Approximation of $\bar {\psi} - \text{Integrals}$ of Periodic Functions by Fourier Sums (small Smoothness). IIof Periodic Functions by Fourier Sums (small Smoothness). II. Institute of Mathematics, NAS of Ukraine, 1998.