1. M. B. Bever and P. E. Duwez, ?On Gradient Composites?, Preliminary Reports, Memoranda and Technical Notes of the ARPA Materials Summer Conference, July 1970, pp. 117?140.
2. J. D. Ferry, ?Control of Mechanical Properties of Swollen Hydrophilic Network Polymers; Layer and Gradient Structures?, Preliminary Reports, Memoranda and Technical Notes of the ARPA Materials Summer Conference July 1970, pp. 611?627.
3. J. J. Aklonis, W. J. MacKnight, and M. Shen, ?Introduction to Polymer Viscoelasticity? (Interscience, New York, 1972).
4. O. E. Ham, ed., ?Copolymerization? (Interscience, New York, 1964).
5. J. B. Yannas and I. E. Isgur, J. Polymer Sci. A,2 (1964) 4719.