1. Flora SSSR [Flora of the USSR], Izd. AN SSSR, Moscow-Leningrad, 1961,XXVI, 406 (in Russian).
2. C. Shih and G. X. Fu,Flora Republicae Popularis Sinicae, Science Press, Beijing, 1983,76, 102.
3. O. D. Barnaulov, L. P. Markova, and T. P. Nadezhdina,Rast. Resursy [Plant Sources], 1983,19, 533. (In Russian).
4. L. M. Belenovskaya, L. P. Markova, T. P. Nadezhdina, and U. Ligaa,Khim. Prirod. Soedin., 1977, 575 [Chem. Nat. Compd., 1977 (Engl. Transl.)].
5. W. Z. Wang, R. X. Tan, Y. M. Yao, Q. Wang, and F. X. Jiang,Phytochemistry, 1994,37, 1347.