@Misc{4ti2,
  author =   {4 ti 2 team},
  title =    {4ti2---A software package for algebraic, geometric and 
              combinatorial problems on linear spaces},
  howpublished = {{A}vailable at \url{www.4ti2.de}}
}

@Misc{lrslib,
  author =   {David Avis},
  title =    {lrslib -- reverse search vertex enumeration program},
  howpublished = {{A}vailable at \url{http://cgm.cs.mcgill.ca/~avis/C/lrs.html}}
}

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    VOLUME = {27},
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}

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     PAGES = {593--615},
}


@incollection {KonovalovM11,
    AUTHOR = {Bovdi, V. A. and Konovalov, A. B.},
     TITLE = {Integral group ring of the first {M}athieu simple group},
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     TITLE = {Integral group ring of the {M}athieu simple group {$M_{12}$}},
   JOURNAL = {Rend. Circ. Mat. Palermo (2)},
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    NUMBER = {1},
     PAGES = {125--136}
}
		
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@Misc{Normaliz,
author = {W. Bruns and B. Ichim and T. R\"omer and R. Sieg and C. S\"oger},
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howpublished ={Available at \url{http://normaliz.uos.de}}
}

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