Simatupang, J.H. , Jufrizal, J. and Supriatno, S. 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 (Aug. 2025), 148–154. DOI:https://doi.org/10.56862/irajtma.v4i2.201.