Van Chinh, Hoang, Dau Ba Thin, Ngo Xuan Luong, Tran Minh Hoi, & Le Thi Huong. " Chemical composition of essential oils of Piper saxicola C. DC. in Ben En National Park, Thanh Hoa Province." VNU Journal of Science: Natural Sciences and Technology [Online], 33.1S (2017): n. pag. Web. 2 Nov. 2024