Pham, V. H., D. P. T. Nguyen, H. N. Tan, and T. L. P. Nguyen. “Optimization of Condition for Pectin Extraction from Pomelo Peel Using Response Surface Methodology”. CTU Journal of Innovation and Sustainable Development, vol. 12, no. 1, Mar. 2020, pp. 50-57, doi:10.22144/ctu.jen.2020.007.