1. Regnault, V. (1838). Ann. Chim. Phys., 2, 69, 151.
2. Drukker, H. L. (1944). Proc. of Symposium on Plastics, Am. Soc. for Testing Materials, Philadelphia, Pa, USA, pp. 165–77.
3. Domininghaus, H. (1976). Die Kunststoffe und Ihre Eigenschaften, VDI-Verlag GmbH. Düsseldorf, p. 566.
4. Baumann, E. (1872). Ann. Chim. Phys., 163, 308–12.
5. Tester, D. A. (1973). In Developments in PVC Technology, (Eds J. H. L. Henson and A. Whelan), Applied Science Publishers, London. Chapter 1.