@Unpublished{	  HeberleGaul:GIF:98,
  author	= {Andreas Heberle and Thilo Gaul},
  title		= {{Syntax einer Sprache zur textuellen Repr{\"a}sentation
		  von Graphen}},
  institution	= {University of Karlsruhe},
  year		= {1998},
  note		= {{Internal Report}},
  verifixkey    = {UKA-Intern},
  file          = {graphsyntax}
}