1. Clark, E. G. C., 1965, Chromatography and the classical methods of analysis, in; Symp. Ident. of Drugs and Poisons, p.54. The Pharmaceutical Society of Great Britain.
2. Corley, C. A., 1967, Bull. T.I.A.F.T. 4.2.
3. Fulton, C. C., 1965, Bull. T.I.A.F.T. 2.4.
4. Fulton, C. C., 1966, Bull. T.I.A.F.T. 3.3.