LIU, S.; WANG, Z.; YU, S.; XIE, C. Transesterification of waste oil to biodiesel using Brønsted acid ionic liquid as catalyst. Bulletin of the Chemical Society of Ethiopia, [S. l.], v. 27, n. 2, p. 289–294, 2013. DOI: 10.4314/bcse.v27i2.14. Disponível em: https://www.ajol.info/index.php/bcse/article/view/88834. Acesso em: 6 oct. 2026.