Hoan, V. X., N. T. Phuong, T. V. Tri, D. D. Manh, D. T. Tung, V. D. Hung, T. T. N. Mai, O. Busse, and J. J. Weigan. “Preparation of Hierarchical Y Zeolite Catalysts for Improved Performance in the Fluid Catalytic Cracking of Residues”. Petrovietnam Journal, Vol. 8, Aug. 2021, pp. 35-42, doi:10.47800/PVJ.2021.08-04.