LE FE DO. Strong consistency of the estimate for the fourth order moment function of the stationary random process. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 43, n. 3, p. 354–358, 1991. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/9615. Acesso em: 12 jan. 2026.