Thanh, Nguyen, 		Anh, Ha, AND 		Yoeup, Paek.
" Effects of macro elements on biomass and ginsenoside production in cell suspension culture of Ngoc Linh ginseng  {Panax vietnamensis Ha et Grushv.)" <em>VNU Journal of Science: Natural Sciences and Technology</em> [Online], Volume 24 Number 3 (15 September 2008)