1. Anderson, L.A., Keene, A.T., Phillipson, J.D. (1982).Planta Medica 46, 25?27.
2. Barz, W. and Ellis, B.E. (1981).Ber. Deutsch. Bot. Ges. 94, 1?26.
3. Berlin, J. (1984).Endeavour 8, 5?8.
4. Gamborg, O.L., Miller, R.A., and Ojima, K. (1968).Exp. Cell Res. 50, 151?158.
5. Hunter, C.S., McCalley, D.V. and Barraclough, A.J. (1982). Alkaloids produced by cultures ofCinchona ledgeriana L. In:Plant Tissue Culture, Proc. 5th Intl. Congr. Plant Tissue and Cell Culture. A. Fujiwara, ed. pp. 317?318. Maruzen Co. Ltd, Tokyo.