1. BAURMANN, M. (1930). Ber. dtsch. ophthal. Ges. (Heidelberg), 48, 364.
2. BERGMANN, J. G., and SANIK, J., Jr. (1957). Analyt. Chem., 29, 241.
3. In "Renal Function: Transactions of the Third Conference";CHINARD, F.P.,1952
4. COLE, D. F. (1959). Brit. J. Ophthal., 43, 268.
5. COLE, D. F. (1960). Ibid., 44, 225.