@mastersthesis{K{"o}berle1998Spitzenformen,
  Author = {Stefan K{"o}berle},
  Title = {Spitzenformen f{"u}r parabolisch erzeugte Schottky-Gruppen},
  Month = aug,
  Year = {1998},
  School = {Universit{"a}t Karlsruhe (TH)},
  Type = {Studienarbeit}
}