Ekstraksi Bitumen Asbuton Menggunakan Asam Format. Journal of Chemical Process Engineering, [S. l.], v. 2, n. 2, p. 41–44, 2017. DOI: 10.33536/jcpe.v2i2.888. Disponível em: https://jurnal.fti.umi.ac.id/index.php/JCPE/article/view/888. Acesso em: 2 jul. 2025.