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2. G. E. R. Schulze Metallphysik (Akademie-Verlag, Berlin, 1974).
3. P. Villars in: Intermetallic Compounds, Principles and Practice, Vol. 1, edited by J. H. Westbrook and R. L. Fleischer (John Wiley and Sons Ltd., Chichester, 1995), p. 227.
4. Structures of the ZrZn22 family: suprapolyhedral nanoclusters, methods of self-assembly and superstructural ordering