On the democratic constant of Haar subsystems in $L_1 [0,1]^d$. Armenian Journal of Mathematics, [S. l.], v. 11, n. 8, p. 1–6, 2019. Disponível em: http://test.armjmath.sci.am/index.php/ajm/article/view/291. Acesso em: 18 oct. 2024.