1. F. Pavelčik and J. Majer, Chem. Zvesti 32(1), 37 (1978).
2. M. Zabel, A. L. Poznyak, L. V. Stopolyanskaya, and V. I. Pavlovskii, Zh. Neorg. Khim. 50(3), 493 (2005) [Russ. J. Inorg. Chem. 50 (3), 437 (2005)].
3. G. M. Sheldrick, SHELXS97 and SHELXL97: Program for the Solution and Refinement of Crystal Structures (University of Göttingen, Göttingen, Germany, 1997).
4. J. Soldánová, F. Pavelčik, and J. Majer, Conf. Coord. Chem. 9, 379 (1983).
5. E. Coronado, M. Drillon, A. Fuertes, et al., J. Am. Chem. Soc. 108(5), 900 (1986).