BARBI, E.; CAMARDA, C. G. Period and cohort effects on elderly mortality: a new relational model for smoothing mortality surfaces. Statistica, [S. l.], v. 71, n. 1, p. 51–69, 2011. DOI: 10.6092/issn.1973-2201/3604. Disponível em: https://rivista-statistica.unibo.it/article/view/3604. Acesso em: 1 oct. 2022.