@Book{		  die90,
  author	= "Volker Diekert",
  address	= "Heidelberg",
  volume	= "454",
  publisher	= "Springer-Verlag",
  series	= "Lecture Notes in Computer Science",
  title		= "Combinatorics on Traces",
  year		= "1990",
  doi		= "10.1007/3-540-53031-2"
}