Vy, N., and L. Duy. “The The Research to Improve the Mechanical Properties and the Water Barrier Properties of Polyvinyl Ancol Film by Graphen Oxide”. Science & Technology Development Journal: Natural Sciences, Vol. 4, no. 2, June 2020, pp. 421-9, doi:https://doi.org/10.32508/stdjns.v4i2.601.