1. A. Gottschalk, “The Enzymes,” 2nd Edition, Vol.4 Academic Press, N.Y., 1960, p. 461.
2. R. Drzeniek, Current Topics in Microbiology and Immunology, 59, Springer-Verlag, Berlin, 1972, p. 35.
3. H. R. Maurer, “Disc Electrophoresis and Related Techniques of Polyacrylamide Gel Electrophoresis,” Walter de Grayter, N.Y., 1971, p. 46.