1. O. V. Mikhailov, Heterocyclic Commun. 7(1), 79 (2001).
2. O. V. Mikhailov, Asian Chem. Lett. 12(4), 258 (2008).
3. A. D. Becke, J. Chem. Phys. 98(7), 1372 (1993).
4. M. J. Frisch, G. W. Trucks, H. B. Schlegel, et al., Gaussian 98, Gaussian, Inc., Pittsburg, 1998.
5. Yu. N. Kukushkin, Coordination Chemistry (Vysshaya Shkola, Moscow, 1985) [in Russian].