@InCollection{	  die95teubner,
  author	= "Volker Diekert",
  address	= "Stuttgart",
  booktitle	= "Teubner Taschenbuch der Mathematik, Teil II",
  pages		= "65--79",
  publisher	= "Teubner",
  title		= "Komplexit{\"a}tstheorie",
  year		= "1995"
}