NAIR, N. U.; SANKARAN, P. G.; RAMESH, N. P. Discrete distributions with bathtub-shaped hazard rates. South African Statistical Journal, [S. l.], v. 51, n. 1, p. 81–102, 2017. DOI: 10.37920/sasj.2017.51.1.5. Disponível em: https://www.journals.ac.za/index.php/sasj/article/view/5225. Acesso em: 3 apr. 2026.