1. Chitin (Pergamon, New York, 1977).
2. Natural Chelating Polymers (Pergamon, New York, 1973), p. 100.
3. Preparation and evaluation of two microbiological media from shrimp heads and hulls
4. U.S. Patent 2,047,226 (1936).
5. Natural Chelating Polymers (Pergamon, New York, 1973), pp. 164 and 177.