KAO, C.-S. On errors of a unified family of approximation forms of bivariate continuous functions. Tamkang Journal of Mathematics, [S. l.], v. 34, n. 4, p. 371–382, 2003. DOI: 10.5556/j.tkjm.34.2003.239. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/239. Acesso em: 29 apr. 2024.