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  [[20XBBN+78[120X]   [16XBrown,   H.,  Bülow,  R.,  Neubüser,  J.,  Wondratschek,  H.  and
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  [[20XGEN97[120X] [16XGähler, F., Eick, B. and Nickel, W.[116X, [17XComputing maximal subgroups and
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  [[20XHah95[120X] ([1m[31mHahn, T.[15X, Ed.), [17XInternational Tables for Crystallography, Volume A,
  Space-group Symmetry[117X, Kluwer, 4th edition, Dordrecht (1995).
  
  [[20XWon95[120X]  [16XWondratschek,  H.[116X  ([1m[31mHahn,  T.[15X,  Ed.),  [17XIntroduction  to space-group
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