1. Prochrom s.a. (ex Chromatelf), Chemin des Blanches Terres, B.P. 9, F-54250, Champigneulles, France.
2. K. Jones, Chromatographia25, 437 (1988).
3. H. Orozco, 1st International Conf. on Preparative and Upscale Chromatogr. Paris, France, 16–18th Jan. 1986; personal communication, Research Dept., S.N.P.A., Lacq, France.
4. K. Jones, Chromatographia, accepted for publication.
5. K. Jones, Chromatographia25, 443 (1988).