@Article{	  Lohrey98ac,
  author	= "Markus Lohrey",
  title		= "NP-Completeness Results Concerning the Transformation of
		  Logic Programs into Attribute Grammars",
  journal	= "Acta Cybernetica",
  volume	= "13",
  number	= "3",
  year		= "1998",
  pages		= "209--224"
}