1. Abelson, P. H., E. T. Bolton and E. Aldous: J. biol. Chem. 198, 165 (1952).
2. Aiyer, P. A. S.: Mem. Dept. Agric., India, Chem. Ser. 5, 173 (1920).
3. Aronoff, S.: Techniques of Radiobiochemistry. Ames, Iowa: Iowa State College Press. 1956.
4. Beerstecher, E.: Petroleum Microbiology. New York: Elsevier Press, Inc. 1954.
5. Block, R. J., E. L. Durrum and G. Zweig: A Manual of Paper Chromatography and Paper Electrophoresis. New York: Academic Press, Inc. 1955.