1. H. G. Gibbs, W. L. Hall and W. Mansfield Clark, Supplement No. 69 to the Public Health reports, Washington DC (1928).
2. A. S. Holt and C. S. French, Arch. Biochem., 19 (1948) 368.
3. P. Ehrlich, Das Sauerstoff-Bedürfniss des Organismus, Hirschwald, Berlin, 1885, see also “The Requirement of the Organism for Oxygen” tr. editors, in The Collected Papers of Paul Ehrlich, Vol. 1, H. H. Dale, F. Himmelweit and M. Marquardt (eds.), Pergamon Press, 1956, p. 433
4. International Union of Biochemistry: Report of the Commission on Enzymes (1964). (Reprinted in Comparative Biochemistry, Vol. 13, M. Florkin and E. H. Stotz (eds.), 1965, p. 84.
5. F. Rohmann and W. Spitzer, Chem. Ber., 28 (1895) 567.