1. Teach, W. C. and Kiessling, G. C., Polystyrene, Reinhold Publishing Corporation, New York, 1960. Chapter 4.
2. Basdekis, C. H. in Manufacture of Plastics, (Ed. Smith, W. M.), Reinhold Publishing Corporation, New York, 1964. Chapter 10.
3. Brydson, J. A., Plastics Materials, Iliffe Books Ltd., London, (2nd Ed.), 1969, Chapter 13.
4. Grim, J. M., U.S. Patent 2715118 (1955).
5. Staudinger, H. and Steinhofer, A., Ann., 517, 35 (1935).