1. and Engineering Materials 2: An Introduction to Microstructures, Processing and Design, p. 250, Pergamon Press, England (1988).
2. Modern Plastics, July 1990, p. 16.
3. Principles of Polymer Systems, p. 48, Hemisphere Publishing Corporation, New York (1989).
4. THE NUCLEATION OF MICROCELLULAR FOAMS IN SEMI CRYSTALLINE THERMOPLASTICS∗
5. and U.S. Patent 4,424,293 (1984).