1. The Northwest Plateau Institute of Biology: Tebatan Medicine Records (Qinghai Peoples publishing House, China, 1991, in Chinese).
2. H. Q. Yuan, Y. P. Shi, X. J. Qu, Q. Q. Yao and X. G. Shu: Chinese Journal of Marine Drugs [in Chinese]. Vol. 19, (2000). p.7.
3. J. M. Gao, J. Shen, X. Yang and J. K. Liu: Acta Botanica Yunnanica [in Chinese]. Vol. 23, (2001). p.35.
4. W. Y. Kang, C. Q. Li and Z. Q. Ji: Chemistry of Natural Compounds. Vol. 47, (2011). p.91.
5. R. Zhang, A. L. Lu, D. Wang, G. Chen, Q. Dang and Y. H. Pei: Journal of Shenyang Pharmaceutical University [in Chinese]. Vol. 24, (2007). p.549.