Teodora ZAPRYANOVA; Diko SOUROUJON. Detailed Study on Characterization of Best Algebraic Approximation by a Generalized Modulus of Smoothness. Theory and Practice of Mathematics and Computer Science Vol. 7, [S. l.], p. 159–169, 2021. DOI: 10.9734/bpi/tpmcs/v7/7352D. Disponível em: https://stm.bookpi.org/TPMCS-V7/article/view/164. Acesso em: 4 jun. 2026.