SARGSYAN, Artsrun. Nonlinear approximation with respect to the Faber-Shauder system and greedy algorithm. Armenian Journal of Mathematics, Yerevan, Armenia, v. 3, n. 1, p. 69 pages, 2010. Disponível em: https://armjmath.sci.am/index.php/ajm/article/view/68. Acesso em: 4 apr. 2025.