# XGAP : a GAP 4 package - References

[Cav86]
  Alberto Cavicchioli.
  A countable class of non-homeomorphic homology spheres with Heegaard genus two.
  Geom. Dedicata, 20:345--348, 1986.
[FJ65]
  K. Ferber and H. Jürgensen.
  A Programme for Drawing a Lattice.
  In J. Leech, editor, Computational Problems in Abstract Algebra, pages 83--86, 1970.
[HR91]
  Derek F. Holt and Sarah Rees.
  A Graphics System for Displaying Finite Quotients of Finitely Presented Groups.
  In L. Finkelstein and W. M. Kantor, editors, Groups and Computation, pages 113--126, 1991.
[SK95]
  Susanne Keitemeier.
  Graphische Darstellung von Untergruppendiagrammen im Computeralgebraprogramm GAP.
  Diplomarbeit, Lehrstuhl D für Mathematik, Rheinisch Westfälische Technische Hochschule, Aachen, Germany, 1995.

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