Hai, N. T., and T. H. Phuong. “A Green Method for the Acylation of Secondary Alcohols With [CholineCl][ZnCl2]3-Catalyzed by Ultrasonic Method”. Science & Technology Development Journal: Natural Sciences, Vol. 1, no. 6, Jan. 2019, pp. 169-76, doi:https://doi.org/10.32508/stdjns.v1i6.684.