1. Feeney, R. E., Komatsu, S. K.: Struct. Bonding 1, 149 (1966.
2. Schmiedeberg, N.: Arch. Exp. Pathol. Pharmakol. 33, 101 (1894).
3. Laufberger, V.: Biol. Listy 19, 73 (1934).
4. — Bull. Soc. Chim. Biol. 19, 1575 (1937).
5. Pollycove, M.: In: The metabolic basis of inherited disease, 2nd edit., p. 780 (1966).