Simatupang, Joel Hasoloan, Jufrizal Jufrizal, and Supriatno Supriatno. 2025. “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 (2):148-54. https://doi.org/10.56862/irajtma.v4i2.201.