1. Br Pat 578079 (1996).
2. Comprehensive;Pilati,1989
3. and in Encyclopedia of Polymer Science and Engineering, 2nd edn, Vol 12, John Wiley & Sons, New York. pp 1-75 (1988).
4. and in Encyclopedia of Chemical Technology, 4th edn, Vol 19, John Wiley & Sons, New York. p 609 (1996).
5. DuPont, US patent 5 510 454 (1996).