Pungwiwat, Narongporn, Thoranis Deethayat, Nuapon Duongbia, Wassana Kamopas, and Tanongkiat Kiatsiriroat. “Use of copper metal balls as internal heat distributor in fixed-bed pyrolyzer of spent coffee grounds for biochar production”. Agriculture and Natural Resources 57, no. 4 (August 31, 2023): 579–. accessed October 7, 2026. https://li01.tci-thaijo.org/index.php/anres/article/view/260447.