@InCollection{	  die97brauer,
  author	= "Volker Diekert",
  address	= "Heidelberg",
  booktitle	= "Foundations of Computer Science",
  editor	= "{\relax Ch}ristian Freksa and Matthias Jantzen and
		  R{\"u}diger Valk",
  volume	= "1337",
  pages		= "251--260",
  publisher	= "Springer-Verlag",
  series	= "Lecture Notes in Computer Science",
  title		= "A Remark on Trace Equations",
  year		= "1997",
  doi		= "10.1007/BFb0052093"
}