Chávez, G., Vivas, E., Bravo, B., Ysambertt, F., & Márquez, N. (1). Isolation and characterization of neutral, acid and basic fractions from a heavy crude oil and its natural surfactants. Revista Técnica Da Faculdade De Engenharia Da De Zulia, 26(3). Obtido de https://mail.produccioncientificaluz.org/index.php/tecnica/article/view/5818