@InProceedings{	  dk03,
  title		= "A Remark about Quadratic Trace Equations",
  author	= "Volker Diekert and Manfred Kufleitner",
  booktitle	= "Developments in Language Theory: DLT 2002, Kyoto, Japan",
  editor	= "M. Ito and M. Toyama",
  publisher	= "Springer-Verlag",
  series	= "Lecture Notes in Computer Science",
  year		= "2003",
  volume	= "2450",
  pages		= "59--66",
  doi		= "10.1007/3-540-45005-X_5"
}