[BBN+78] Brown, H., Bülow, R., Neubüser, J., Wondratschek, H. and Zassenhaus, H., Crystallographic Groups of Four-Dimensional Space, John Wiley, New York (1978).
[Hah95] (Hahn, T., Ed.), International Tables for Crystallography, Volume A, Space-group Symmetry, Kluwer, 4th edition, Dordrecht (1995).
[NPW81] Neubüser, J., Plesken, W. and Wondratschek, H., An emendatory discursion on defining crystal systems, Match, 10 (1981), 77--96.
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