1. Preston, F.W., Brit. Plast, 16, p. 440 (1944).
2. Brintrup, I. (1975) PhD Thesis, Technischen Hochschule, Aachen
3. reproduced in D. Hull, An Introduction to Composite Materials , Cambridge University in Press, p. 83(1981).
4. Kelly, A., Microstructural Parameters of an Aligned Fibrous Composite, in "The Properties of Fibre Composites" proceedings of a conference held at National Physical Laboratory, Nov. 4, 1971, IPC Science and Technology Press, Ltd., p. 5 (1972).