Van Chinh, Hoang, 		Ba Thin, Dau, 		Xuan Luong, Ngo, 		Minh Hoi, Tran, AND 		Thi Huong, Le.
" Chemical composition of essential oils of Piper saxicola C. DC. in Ben En National Park, Thanh Hoa Province" <em>VNU Journal of Science: Natural Sciences and Technology</em> [Online], Volume 33 Number 1S (10 October 2017)