KUMAR, G.; KANT, R. Efforts to examine coal and fly ash. International journal of health sciences, [S. l.], v. 6, n. S5, p. 2335–2349, 2022. DOI: 10.53730/ijhs.v6nS5.9146. Disponível em: https://sciencescholar.us/journal/index.php/ijhs/article/view/9146. Acesso em: 21 may. 2026.