Nguyen, V. L., T. S. Nguyen, and T. Tran. “Fabrication of a Composite Film Based on the Extracted Aloe Vera Solution and Polyvinyl Alcohol by Freeze–thawing Method”. Science & Technology Development Journal: Natural Sciences, Vol. 6, no. 2, June 2022, pp. 2034-40, doi:https://doi.org/10.32508/stdjns.v6i2.1117.