@InProceedings{	  die94kyotows,
  author	= "Volker Diekert",
  booktitle	= "{W}ords, {L}anguages and {C}ombinatorics II (Kyoto, Japan
		  1992)",
  editor	= "M. Ito and H. J{\"u}rgensen",
  pages		= "87--97",
  publisher	= "World Scientific, Singapore",
  title		= "Partial Traces",
  year		= "1994"
}