JOARDER, Anwar H.; ISLAM, S. M. Shahidul. Cardinality of Joint and Disjoint Sets and a Related Discrete Distribution. Engineering International, Dhaka, Bangladesh, v. 10, n. 1, p. 55–68, 2022. Disponível em: https://ei.observer/article/view/681. Acesso em: 27 jul. 2026.