@InBook{	  wahler:pattern:2008,
  author	= {Michael Wahler},
  booktitle	= {Model-Driven Software Development: Integrating Quality
		  Assurance},
  chapter	= {some chapter},
  editor	= {J. Rech and C. Bunse},
  language	= {USenglish},
  publisher	= {Idea Group},
  title		= {A Pattern Approach to Increasing the Maturity Level of
		  Class Models},
  url		= {http://kuznyechik.googlepages.com/wahler-maturity-2008draft.pdf}
		  ,
  year		= 2008,
  user		= {pretscha}
}