1. L. I. Khmelnitskii, S. S. Novikov, and T. I. Godovikova,The Chemistry of Furoxans (Synthesis and Structure) [in Russian], Nauka, Moscow (1981).
2. G. Sbrana, M. Ginannenschi, and M. P. Marzocchi,Spectrochim. Acta.,23, No. 6, 1757–1762 (1967).
3. D. N. Christensen, P. W. Jensen, J. T. Nielsen, and O. F. Nielsen, ——ibid.,,29, No. 7, 1393–1405 (1973).
4. N. V. Bychkovskaya, V. V. Stolpakova, I. B. Karaulova, et al., “Vibration spectra of furazan and its derivatives,” Paper filed at ONIITÉKhIM, No. 18khp-83d, Leningrad (1982).
5. N. E. Boyer, G. M. Czernyak, and H. S. Gutovsky,J. Am. Chem. Soc.,79, No. 16, 1748–1751 (1955).