References
  
  [GAP]  A  Bibliography  of  GAP  related  publications,  The  GAP Group,
  http://www.gap-system.org/Doc/Bib/gap-publishednicer.bib.
  
  [Bog]        Bogomolny,        A.,       Sam       Loyd's       Fifteen,
  http://www.cut-the-knot.org/pythagoras/fifteen.shtml.
  
  [CN04]  Celler,  F. and Neunhöffer, M., XGAP, a graphical user interface
  for    GAP,    Version    4.21   (2004),   ((Refereed   GAP   package)),
  http://www-groups.mcs.st-and.ac.uk/~neunhoef/Computer/Software/Gap/xgap4.html.
  
  [Köla]           Köller,           J.,           Peg          Solitaire,
  http://www.mathematische-basteleien.de/solitaire.htm.
  
  [Kölb]           Köller,           J.,           Rubik's           Cube,
  http://www.mathematische-basteleien.de/rubikscube.htm.
  
  [LN07]  Lübeck,  F.  and  Neunhöffer, M., GAPDoc, A Meta Package for GAP
  Documentation,   Version   1.0   (2007),   ((Refereed   GAP   package)),
  http://www.math.rwth-aachen.de/~Frank.Luebeck/GAPDoc.
  
  [Neu07] Neunhöffer, M., IO, Bindings for low level C library IO, Version
  2.2                (2007),                ((GAP               package)),
  http://www-groups.mcs.st-and.ac.uk/~neunhoef/Computer/Software/Gap/io.html.
  
  [OR]  O'Connor,  J.  J.  and Robertson, E. F., University of St Andrews,
  http://www-history.mcs.st-and.ac.uk/HistTopics/Mathematical_games.html.
  
  [OR00]  O'Connor,  J.  J.  and  Robertson, E. F., Mathematical MacTutor,
  University           of           St           Andrews           (2000),
  http://www-groups.dcs.st-and.ac.uk/~edmund/mactutor.html.
  
  [Sch]    Schönert,    M.,    Analyzing    Rubik's    Cube    with   GAP,
  http://www.gap-system.org/Doc/Examples/rubik.html.
  
  [NCu]            The            ncurses            C            library,
  http://dickey.his.com/ncurses/ncurses.faq.html.
  
  [WPNBB07]  Wilson,  R. A., Parker, R. A., Nickerson, S., Bray, J. N. and
  Breuer,   T.,   AtlasRep,   A  GAP  Interface  to  the  Atlas  of  Group
  Representations,   Version   1.3.1  (2007),  ((Refereed  GAP  package)),
  http://www.math.rwth-aachen.de/~Thomas.Breuer/atlasrep.
  
  
  
  -------------------------------------------------------