YOGESHKUMAR K. PATEL; VYAS, Rajendra. Approximation by sub-matrix means for functions in \(H^{\vec{p}}_{\alpha,\beta}[\mathbb{T}^2]\) class using sub-matrix means. Serdica Mathematical Journal, Sofia, Bulgaria, v. 51, n. 2, p. 115–132, 2025. DOI: 10.55630/serdica.2025.51.115-132. Disponível em: https://serdica.math.bas.bg/index.php/serdica/article/view/64. Acesso em: 14 oct. 2026.