References
  
  [Bre96]  Brent,  R.  P.,  Factorization of the Tenth and Eleventh Fermat
  Numbers                             (1996),                            (
  ftp://ftp.comlab.ox.ac.uk/pub/Documents/techpapers/Richard.Brent/rpb161tr.dvi.gz
  )
  
  [Bre04]     Brent,     R.     P.,     Factor     Tables     (2004),    (
  http://web.comlab.ox.ac.uk/oucl/work/richard.brent/factors.html )
  
  [Bre89]   Bressoud,   D.   M.,   Factorization  and  Primality  Testing,
  Springer-Verlag (1989)
  
  [Coh93]  Cohen,  H.,  A Course in Computational Algebraic Number Theory,
  Springer-Verlag (1993)
  
  [LN07]  Lübeck, F. and Neunhöffer, M., GAPDoc (Version 1.0), RWTH Aachen
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