1. Amoroso, E. C.: Colchicine and tumor growth. Nature (Lond.) 135, 266 (1935).
2. Augustin, B., R. Giovannini, S. J�vorka u. P. Rom: Ungarische Heilpflanze [Ungarisch]. Budapest: Mez?gazd. Kiad� 1948.
3. Belkin, M.: Effect of podophyllin on transplanted mouse tumors. Fed. Proc. 6, 308 (1947).
4. Cain, B. F.: Potential antitumor agents. I. Polyporic acid series. J. chem. Soc. 936 (1961).
5. Cain, B. F.: Tumor inhibitors from plant sources. Part I. J. chem. Soc. 2599 (1961).