Han, N. et al. 2025. Effect of ExtractionConditions on Polyphenol Content and Antioxidant Activityof the Extract from Gynura Procumbens(Lour) Merr. Leaves. Vietnam Journal of Agricultural Sciences. 14, 8 (Jun. 2025), 1248–1260. DOI:https://doi.org/10.31817/tckhnnvn.2016.14.8..