AGA E-B, LI H-J, CHEN J, Li P.  2012.  Chemical constituents from the aerial parts of Codonopsis nervosa. CJNM Chinese Journal of Natural Medicines. 10(5):366-369.

Yang H, CHEN J, Cai H, Xu H, Tong L, Cai B.  2009.  LC Determination of Five Flavonoid Aglycones in the Tibetan Medicinal Plant Oxytropis falcata Bunge. Chroma Chromatographia : An International Journal for Rapid Communication in Chromatography, Electrophoresis and Associated Techniques. 70(9-10):1451-1454.