1. [1] Venturini, G.; Welter, R.; Malaman, B. J. Alloys Compd., 185 (1992), pp. 99-107
2. [2] Thomas, J. M. Nature, 491 (2012), pp. 186-187
3. [3] Specklin, D.; Mameri, S.; Loukopoulos, E.; Kostakis, G. E.; Welter, R. Polyhedron, 100 (2015), pp. 359-372
4. [4] International Tables For Crystallography (Hahn, T., ed.), Space-group Symmetry, A, Springer, 1993
5. [5] Bragg, L.; Bragg, W. Nature, 90 (1912), p. 219