1. G. Odian, Principles of Polymerization, Wiley-Interscience, New York, 1981, p. 33.
2. S. van der Van, Propylene/ethylene and other Polyolefins, Chap. 1, Elsevier, New York, 1990.
3. Propylene-Ethylene Copolymers: Ethylene Content Influence on Molecular and Thermomechanical Properties