PUNGWIWAT, N.; DEETHAYAT, T.; DUONGBIA, N.; KAMOPAS, W.; KIATSIRIROAT, T. Use of copper metal balls as internal heat distributor in fixed-bed pyrolyzer of spent coffee grounds for biochar production. Agriculture and Natural Resources, Bangkok, Thailand, v. 57, n. 4, p. 579–, 2023. Disponível em: https://li01.tci-thaijo.org/index.php/anres/article/view/260447. Acesso em: 7 oct. 2026.