Akgün, Ramazan. “Characterization of Mixed Modulus of Smoothness in Weighted \(L^p\) Spaces”. J. Numer. Anal. Approx. Theory 45, no. 2 (December 9, 2016): 99–108. Accessed May 6, 2024. https://ictp.acad.ro/jnaat/journal/article/view/1094.