@article{Quaisser1998,
  author    = {Quaisser, Erhard},
  title     = {Tetraeder-Geometrie und Symmetrieaspekte},
  year      = {1998},
  language  = {de}
}
@article{Quaisser1998,
  author    = {Quaisser, Erhard},
  title     = {Lote am Tetraeder - eine Exkursion in die Raumgeometrie},
  year      = {1998},
  language  = {de}
}
@article{Quaisser1998,
  author    = {Quaisser, Erhard},
  title     = {Lower levels of Euclidean planes},
  year      = {1998},
  language  = {en}
}
@article{Quaisser1998,
  author    = {Quaisser, Erhard},
  title     = {Tetraeder-Geometrie und Symmetrieaspekte},
  year      = {1998},
  language  = {de}
}
@article{QuaisserAlpers1998,
  author    = {Quaisser, Erhard and Alpers, Karsten},
  title     = {Lattices in the Pseudoeuclidean plane},
  year      = {1998},
  language  = {en}
}
@article{Quaisser1998,
  author    = {Quaisser, Erhard},
  title     = {Tetraeder-Essay, Symmetrie der Tetraeder},
  year      = {1998},
  language  = {de}
}
@article{Quaisser1997,
  author    = {Quaisser, Erhard},
  title     = {OSTWALD-Muster und Parkette - Anregungen aus der Diskreten Geometrie f{\"u}r den Mathematikunterricht},
  year      = {1997},
  language  = {de}
}
@article{Quaisser1997,
  author    = {Quaisser, Erhard},
  title     = {OSTWALD-Muster und Parkette - Anregungen aus der Diskreten Geometrie f{\"u}r den Mathematikunterricht},
  year      = {1997},
  language  = {de}
}
@article{Quaisser1997,
  author    = {Quaisser, Erhard},
  title     = {Schwache Kongruenzebenen},
  year      = {1997},
  language  = {de}
}
@article{QuaisserSprengel1997,
  author    = {Quaisser, Erhard and Sprengel, Jens-Uwe},
  title     = {Polyominos und Puzzles},
  year      = {1997},
  language  = {de}
}