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J. H. . Simatupang, J. Jufrizal, and S. Supriatno, “Thermal Efficiency Analysis of a Downdraft Gasifier-Type Biomass Stove with Variations in the Mass of Wood Charcoal and Wood Pellet Mixtures”, IRA J.Tek. Mesin Dan Apl, vol. 4, no. 2, pp. 148–154, Aug. 2025.