# crystcat : a GAP 4 package - References

[BBNWZ78]
  H. Brown, R. Bülow, J. Neubüser, H. Wondratschek, and H. Zassenhaus.
  Crystallographic Groups of Four-Dimensional Space.
  John Wiley, New York, 1978.
[Hah95]
  T. Hahn, editor.
  International Tables for Crystallography, Volume A, Space-group Symmetry, 4th Edition.
  Kluwer, Dordrecht, 1995.
[NPW81]
  J. Neubüser, W. Plesken, and H. Wondratschek.
  An emendatory discursion on defining crystal systems.
  Match, 10:77--96, 1981.

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