Nguyen, Hai, Nhan Nguyen, and Mai Nguyen. “COMPARATIVE STUDY ON TOTAL POLYPHENOLS, FLAVONOIDS CONTENT, AND ANTIOXIDANT ACTIVITY OF PROPOLIS FROM VIET NAM AND OTHER COUNTRIES”. VNUHCM Journal of Science and Technology Development 14, no. 2 (June 30, 2011): 66-74. Accessed July 2, 2025. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/1945.