1. British Pharmaceutical Codex, The Pharmaceutical Press, London, 1973
2. S. Glasstone. Thermodynamics for Chemists, Van Nostrand, 1947
3. I.M. Klotz. Chemical Thermodynamics, Benjamin, New York, 1964
4. A. Cammarata. J. pharm. Sci., 64, 2025 (1975)
5. K.H. Meyer and H. Hemmi. Biochem. Z. 277, 39 (1935)