Sibello-Hernández, Rita Y., et al. “Characterization and Evaluation of Liquid Residuals from Refinery ‘Camilo Cienfuegos’, Cuba”. Revista Cubana De Química, vol. 28, no. 2, May 2016, pp. 561-7, https://cubanaquimica.uo.edu.cu/index.php/cq/article/view/1143.