SIHOMBING, Junifa Layla et al. Optimization of Indonesia biodiesel production from rubber seed oil using natural zeolite modification. Jurnal Pendidikan Kimia, [S. l.], v. 10, n. 2, p. 387–392, 2018. DOI: 10.24114/jpkim.v10i2.10919. Disponível em: https://jurnal.unimed.ac.id/2012/index.php/jpk/article/view/10919. Acesso em: 9 jun. 2025.