1. V. P. Bokarev, Neorg. Mater., 22, 347/348 (1986).
2. S. S. Batsanov and V. P. Bokarev, Neorg. Mater., 23, 1054–1056 (1987).
3. E. Roduner, Chem. Soc. Rev., 35, 583–592 (2006).
4. S. S. Batsanov, Experimental Foundations of Structural Chemistry. Moscow Univ. Press, Moscow (2008).
5. K. Pirkkalainen and R. Serimaa, J. Appl. Crystallogr., 42, 442–447 (2009).