Studi Kelayakan Penerapan Blending Fuel Batubara-Ekstraks Ampas Kopi pada Ketel UAP DZL-20 di PT. DDD. Jurnal Lingkungan dan Sumberdaya Alam (JURNALIS), [S. l.], v. 2, n. 2, p. 147–159, 2019. DOI: 10.47080/jls.v2i2.675. Disponível em: https://ejournal.lppm-unbaja.ac.id/index.php/jls/article/view/675. Acesso em: 22 jun. 2025.