Nonlinear approximation in $L^1[0,1]$ with respect to the Haar system. Armenian Journal of Mathematics, [S. l.], v. 2, n. 2, p. 83 pages, 2009. Disponível em: http://test.armjmath.sci.am/index.php/ajm/article/view/55. Acesso em: 15 nov. 2024.