H. Suharyadi, S. R. Haq, T. Juniar, H. Purba, F. Rajabi, and G. A. Subyakta, “Cost Estimation of Coal Utilization Technology for Coal Bed Methane (CBM) Using H₂O₂”, cset, vol. 5, no. 1, pp. 53–61, Oct. 2026.