1. Mahato, S.B. and Otsomaa, L.A. (1998) In: Herz, W., Kirby, G.W., Moore, R.E., Steglich, W. and Tamm, C., eds, Triterpenoid Saponins Progress in the Chemistry of Organic Natural Products (Springer-Verlag/Wien, Austria) Vol. 74, and references therein, pp 2 – 196.
2. Martin-Cordero, C., Reyes, M., Ayuso, M.J. and Toro, M.V. (2001) Z. Naturforsch. 56c, 45 – 48.
3. Lauthier, F., Taillet, L., Trouillas, P., Delage, C. and Simon, A. (2000) Anti-Cancer Drugs 11, 737 – 745 and references therein.
4. Zuco, V., Supino, R., Righetti, S.C., Cleris, L., Marchesi, E., Gambacorti-Passerini, C. and Formelli, F. (2002) Cancer Lett. 175, 17 – 25.