1. H. Thieme and U. Kurzik-Dumke, Pharmazie37, 370 (1982).
2. V. Glatt and W. Meier, Mitt. Geb. Lebensmittelunters. Hyg.71, 526 (1980).
3. J. M. Van der Poli and D. Van de Lagemaat, J. Chromatography197, 263 (1980).
4. M. Tena, M. Magallanes, and R. Garrido, An. Quim. Ser. C78, 256 (1982).
5. T. S. Ma and V. Horak, Microscale Manipulations in Chemistry, New York: Wiley. 1976. p. 139.