SOFYAN, Tomi; WILOGO, Alwi Zenar; SAPUTRA, Arif Yasin; IRJANTOKO, Rahmat; MISDIYANTA, Partama; TRIANDA, Obrin. A Comparative Study of Coal Quality: Insights from Actual and Proximate Analysis Models. International Journal of Hydrological and Environmental for Sustainability, [S. l.], v. 4, n. 1, p. 23–31, 2026. DOI: 10.58524/ijhes.v4i1.538. Disponível em: https://journal.foundae.com/index.php/ijhes/article/view/538. Acesso em: 16 jan. 2026.