BETTUZZI, G. On the definition of quadratic indices of correlation between standardized deviations. Statistica, [S. l.], v. 46, n. 3, p. 325–341, 1986. DOI: 10.6092/issn.1973-2201/716. Disponível em: https://rivista-statistica.unibo.it/article/view/716. Acesso em: 6 may. 2024.