1. E. Tojo, J. Nat. Prod.,52, No. 5, 909 (1989).
2. M. K. Yusupov, B. Ch. Chommadov, and Kh. A. Aslanov, Khim. Prir. Soedin., No. 1, 86 (1991).
3. A. A. Trozyan, M. K. Yusupov, and È. S. Avundzhan, Rast. Res.,9, No. 4, 556 (1973).
4. F. Šantavý, Alkaloidy ocunovitych rostlin a jejich derivaty [Alkaloids ofColchicum Plants and their Derivatives] [in Czech], Stat. Zdrav. Nakl., Prague (1958).
5. K. R. Fell and D. Ramsden, Lloydia,30, No. 2, 123 (1967).