1. Cahill, J. and Retzik, M. (1985) Int. Lab. May, 48.
2. Donovan, J.W. (1969) J. Biol. Chem. 244, 1961.
3. Goodwin, T.W. and Mercer, E.I. (1983) Introduction to Plant Biochemistry, 2nd edn, Pergamon, Oxford.
4. Headridge, J.B. (1961) Photometric Titrations,Pergamon, New York.
5. IUPAC (1979) Standard Methods for the Analysis of Oils, Fats and Derivatives,6th edn, Pergamon, Oxford.