  
  
  [1m[4m[31mReferences[0m
  
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  [33m[H00]  [0m[1m[31mde  la  Harpe,  P.  [0m,  [34mTopics  in Geometric Group Theory[0m, Chicago
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  [33m[K99]  [0m[1m[31mKeller,  T.  P.  [0m,  [34mFinite  Cycles of Certain Periodically Linear
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  [33m[L06]  [0m[1m[31mLagarias,  J.  C.  [0m,  [34m3x+1 Problem Annotated Bibliography[0m (2006),
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  [33m[S02]  [0m[1m[31mSoicher,  L. [0m, [34mGRAPE -- GRaph Algorithms using PErmutation groups
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