1. E. V. Babaev, A. V. Efimov, S. G. Zhukov, and V. B. Rybakov, Khim. Geterotsikl. Soedin., No. 7, 983 (1998).
2. E. V. Babaev, S. V. Bozhenko, D. A. Maiboroda, et al., Bull. Soc. Chim. Belg. 106(11), 631 (1997).
3. S. G. Zhukov, V. B. Rybakov, E. V. Babaev, et al., Acta Crystallogr., Sect. C: Cryst. Struct. Commun. C53, 1909 (1997).
4. E. V. Babaev, S. V. Bozhenko, S. G. Zhukov, and V. B. Rybakov, Khim. Geterotsikl. Soedin., No. 8, 1105 (1997).
5. V. B. Rybakov, S. G. Zhukov, E. V. Babaev, et al., Kristallografiya 44(6), 1067 (1999) [Crystallogr. Rep. 44, 997 (1999)].