Kajiwara et al., "Phosphonitrilic Chloride: 23, Substitution Reaction of Phosphonitrilic Chloride Trimer with Sodium Hydroxymethylphenolate and Polymerization of Substitution Products", Polymer, 1975, vol. 16, Jan. 21-24. |
Kumar, Devendra, et al., "High-Strength Fire-and Heat-Resistant Imide Resins Containing Cyclotriphosphazene and Hexafluoroisopropylidene Groups," Journal of Polymer Science, vol. 22, John Wiley & Sons, Inc. (1984), pp. 927-943. |
Kumar, Devendra, "Polybismaleimide Containing Tetrakisphenoxycyclotriphosphazenes," Journal of Polymer Science, vol. 23, John Wiley & Sons, Inc. (1985), pp. 1661-1670. |