Nalepa, C.J. and A.A. Eisenbraun .Proceedings of the SPI-30th Annual Technical/Marketing Conference, Toronto, Canada, October 15-17, 1986, pp. 228-233.
2.
Hepburn, C. "Polyurethane Elastomers," Applied Science Publishers , N.Y., pp. 114, 115 (1982).
3.
Hepburn, C. "Polyurethane Elastomers," Applied Science Publishers , N.Y., pp. 351-353 (1982).
4.
Ortel, G. ed., "Polyurethane Handbook," Carl Hanser Verlag, Munich, p. 104 (1985).