1. Cotton, F.A. and Walton, R.A., Metal-Metal Multiple Bonds, Moscow: Mir, 1985.
2. Mal’kova, T.A. and Shafranskii. V.N., Zh. Neorg. Khim., 1975, vol. 20, no. 5, p. 1308.
3. Guseva, E.V. and Karimova, D.T., Zh.Obshch. Khim. 2008, vol. 78, no. 1, p. 154.
4. Cotton, F.A., Lin, C, and Murillo, C.A., Acc. Chem. Res., 2001, vol. 34, p. 759.
5. Karakhanov, E.A., Maksimov, A.L., and Runova, E.A., Usp. Khim., 2005, vol. 74, no. 1, p. 104.