1. ASTM D 1556, Standard Terminology Relating to Rubber, American Society for Testing and Materials (2008), Philadelphia, PA, Vol. 9.01.
2. ISO 1382, Rubber – Vocabulary, International Standards Organization (1997), Geneva, Switzerland.
3. ASTM D 2240, Standard Test Method for Rubber Property – Durometer Hardness, American Society for Testing and Materials (2005), Philadelphia, PA, Vol. 9.01.
4. C. P. Rader, In Handbook of Plastics, Elastomers and Composites, Third Edition, Harper, C. (Ed.) (1996), McGraw-Hill, New York, NY, Chapter 5.
5. M. T. Payne, C. P. Rader, In Elastomer Technology Handbook, Cheremisinoff, N. P. (Ed.) (1993), CRC Press, Boca Raton, FL, Chapter 14.