KOVAL , T. L. Estimation of the convergence rate in central limiting theorem for two-parametric martingale-differences . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 44, n. 8, p. 1138–1141, 1992. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8049. Acesso em: 5 dec. 2025.