ISOLATION AND QUANTITATIVE ANALYSIS OF QUERCITRIN IN LEAVES OF SOME POLYSCIAS SPECIES COLLECTED IN VIETNAM. JMM-NIMM [Internet]. 2026 Aug. 2 [cited 2026 Aug. 10];30(6):pp. 413 - 419. Available from: http://tapchiduoclieu.vn:8080/index.php/jomm/article/view/180