1. Buszard, D. L. In PVC Technology, 4th edn, W. V. Titow. Elsevier Applied Science Publishers, London and New York, 1984, Ch. 5, 6 and 7.
2. ISO 472-1979. Plastics—Vocabulary.
3. ASTM D 883-86b. Standard Terms and Definitions Relating to Plastics.
4. BS 1755. Glossary of Terms Used in the Plastics Industry. Part I: 1982, Polymer and Plastics Technology.
5. Kirkpatrick, A., J. Appl. Phys., 11 (1940) 255.