LATIF, A. .; BANO, A. A result on invariant approximation. Tamkang Journal of Mathematics, [S. l.], v. 33, n. 1, p. 79-82, 2002. DOI: 10.5556/j.tkjm.33.2002.307. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/307. Acesso em: 24 may. 2022.