JUMA, Munyiri; WAWERU, Kamaku; LEWIS, Nyaga. The Non-Negative P0 . International Journal of Sciences: Basic and Applied Research (IJSBAR), Jordan, v. 15, n. 1, p. 379–385, 2014. Disponível em: https://www.gssrr.org/JournalOfBasicAndApplied/article/view/2109. Acesso em: 27 sep. 2025.