1. Erlanger, B. F.: Pharmacol. Rev. 25, 271 (1973)
2. Erlanger, B. F. et al.: In: Methods in Immunology and Immunochemistry, Vol. I, p. 144. Eds.: Williams, C. A. and Chase, M. W. New York-London: Acad. Press 1967
3. Waters Associates Inc. Milford, U.S.A., Analysis of Pharmaceutical Products, p. 8 (1976)