1. Ai K-H, Li F-Y, Li Y, Wang W-B, Wu Y-R (1989) Studies on the naphthaquinone constituents of Onosma confertum W.W. Smith and quantitative determination of shikonin. Acta Bot Sin 31: 549–553
2. Cai W-C, Yuan H-J (eds) (1982) Biology material chemical analysis method in common use. Science Press, Beijing
3. Cao R-Q, Zhao Q-H (1991) Stimulation of shikonin derivatives accumulation in Onosma paniculatum and Lithospermum erythrorhizon cell cultures by fungal elicitors. In: Funisaki S, Endo I, Matsuno R (eds) Biochemical engineering for 2001. Springer, Berlin Heidelberg New York, PP 286–288
4. Compiling Group (eds) (1975) Compilation of nationwide Chinese medicine. People’s Hygiene Press, Beijing
5. Dixon RA (1986) The phytoalexin response: elicitation, signaling and control of host gene expression. Biol Rev 61: 239–291