Simatupang, Joel Hasoloan, Jufrizal Jufrizal, and Supriatno Supriatno. “Thermal Efficiency Analysis of a Downdraft Gasifier-Type Biomass Stove With Variations in the Mass of Wood Charcoal and Wood Pellet Mixtures”. IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) 4, no. 2 (August 20, 2025): 148–154. Accessed September 16, 2025. https://e-journals.irapublishing.com/index.php/IRAJTMA/article/view/201.