@Article{	  DiekertLohrey08,
  author	= "Volker Diekert and Markus Lohrey",
  title		= "Word Equations over Graph Products",
  journal	= "International Journal of Algebra and Computation",
  volume	= "18",
  number	= "3",
  year		= "2008",
  pages		= "493-533"
}