Yen, Pham Hai, 		Hang, Dan, 		Hoang, Nguyen, 		Bang, Ngo, 		Yen, Duong, 		Hung, Nguyen, 		Thanh, Nguyen, 		Tai, Bui, 		Nhiem, Nguyen, AND 		Kiem, Phan.
" Lignans from Gymnema Sylvestre" <em>VNU Journal of Science: Natural Sciences and Technology</em> [Online], Volume 38 Number 4 (12 October 2022)