1. For general reviews of phosphazene chemistry, see: (a) H. R. Allcock, Chemistry and Applications of Polyphosphazenes (John Wiley & Sons, New York, 2003).
2. (b) J. E. Mark, H. R. Allcock, and R. West, Inorganic Polymers (Prentice Hall, New Jersey, 1992).
3. (c) P. Wisian-Neilson, in Encyclopedia of Inorganic Chemistry 6, 3371; R. B. King, Ed. (John Wiley & Sons, Chichester, England, 1994).
4. (d) H. R. Allcock, Chem. Eng. News 63(11), 22 (1985).
5. (e) P. Wisian-Neilson, Phosphazenes: A Worldwide Insight; R. De Jaeger and M. Gleria, Eds.; Nova Science (Hauppauge, New York, 2004) Chapter 5.