Nguyen, H., and P. Tran. “Ionic Liquid Supported on Magnetic Nanoparticles (-Fe2O3@SiO2-IL-ZnxCly) As the Green Catalyst for the Paal-Knorr Reaction”. VNUHCM Journal of Natural Sciences, Vol. 2, no. 5, July 2019, pp. 68-75, doi:https://doi.org/10.32508/stdjns.v2i5.780.