OTOBO, G.; ENDURANCE FEGOR ISOJE; AUGUSTINA UFUOMA IGBUKU. Hazardous Nature of Native Chalk (Calabash chalk). International Journal of Sciences: Basic and Applied Research (IJSBAR), [S. l.], v. 71, n. 1, p. 31–36, 2023. Disponível em: https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/16177. Acesso em: 3 jul. 2024.