Nguyen, Trang, et al. “Determination of Phenolics, Antioxidant Activity and Antidiabetic Potential of Sphagneticola Calendulacea (L.) Pruski Leaves Grown in Vietnam: Http: www.doi.org 10.26538 Tjnpr V7i5.22”. Tropical Journal of Natural Product Research (TJNPR), vol. 7, no. 5, June 2023, pp. 2992-5, https://tjnpr.org/index.php/home/article/view/1991.