  
  
  [1XReferences[0X
  
  [[20XWir98[15X]  [16XWirsching,  G.  J.[15X,  [17XThe dynamical system generated by the 3n+1
  function[15X,  Springer-Verlag,  Lecture  Notes in Mathematics, [19X1681[15X, Berlin
  (1998), viii+158 pages.
  
  
  
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