1. For a review to the end of 1985, see T.J. Simpson, 1987, Nat. Prod. Rep., 4, 639.
2. T.J. Simpson, 1985, in The Chemistry of Natural Products, ed. R.H. Thomson, Blackie, Glasgow, p. 107.
3. K. Hostettmann, M. Hostettmann and A. Marston, 1986, Preparative Chromatography Techniques – Applications in Natural Product Isolation, Springer, Berlin
4. A. Marston and K.Hostettmann, 1991, Nat. Prod. Rep., 8, 391.
5. I.H. Sadler, 1988, Nat. Prod. Rep., 5, 101