1. K. Jones, Chromatographia,25, 437 (1988).
2. J. Orozco, 1st International Conf. on Preparative and Upscale Chromatography, Paris, France, 16–18th Jan, 1986; personal communication, Research Dept., SNEA, Lacq, France.
3. J. H. Knox, H. M. Pyper, J. Chromatogr.,363, 1 (1986).
4. H. Goldberg, G. Cumberlidge, Chromatogr. International,14, 31 (1986).
5. W. M. Skea, J. Dwyer, T. Kierstead, C. Findeisen, Spectra Deux Mille,113, 39 (1986).