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”. VNUHCM Journal of Advanced Research in Natural Sciences, Vol. 6, no. 2, June 2022, pp. 2034-40, doi:https://doi.org/10.32508/stdjns.v6i2.1117.