DIYAJENG LULUK KARLINA. Analysis Efficiency Calculation on Boiler Using Direct (Input-Output) Method in Petrochemical Industry . International Journal of Health Engineering and Technology, [S. l.], v. 4, n. 4, 2025. DOI: 10.55227/ijhet.v4i4.422. Disponível em: https://afdifaljournal.com/journal/index.php/ijhet/article/view/422. Acesso em: 22 may. 2026.