1. G. I. Derkach, I. N. Zhmurova, A. V. Kirsanov, V. I. Shevchenko, and A. S. Shtepanek, Phosphazo Compounds [in Russian], Naukova Dumka, Kiev (1965).
2. A. E. Lutskii, L. I. Samarai, L. A. Kochergina, A. V. Shepel', Z. A. Shevchenko, G. I. Derkach, é. S. Kozlov, and B. I. Drach, ?Participation of phosphorus d orbitals in ? bonding and conjugation with ?-electron systems. II,? Zh. Obshch. Khim., 37, No. 9, 2042?2046 (1967).
3. é. S. Kozlov, S. N. Gaidamaka, Yu. Ya. Borovikov, V. T. Tsyba, and A. V. Kirsanov, ?IR spectra, 31P NMR spectra, and dipole moments of bis(trichloromethyl)phosphazo hydride and -phosphazoalkanes,? Zh. Obshch. Khim., 40, No. 12, 2549?2552 (1970).
4. Yu. Ya. Borovikov and Yu. P. Egorov, ?Dipole moments of heteroorganic compounds,? Teor. Eksp. Khim., 7, No. 5, 663?669 (1971).
5. V. P. Kukhar', A. A. Petrashenko, I. N. Zhmurova, A. A. Tukhar', and S. N. Solodushenko, ?Basicity of phosphazo compounds,? Zh. Obshch. Khim., 40, No. 8, 1696?1699 (1970).