@inbook{2000-Berger-CharactHierarchy,
  author		= "Berger, F.C. and Bommel, P. van and Weide, Th.P. van der",
  title			= "{Characterization hierarchy containing augmented characterizations}",
  publisher		= "Marcel Dekker",
  address		= "New York, New York, USA",
  year			= "2000",
  research_group	= "iris",
  pages			= "1--21",
  class			= "Chapter"
}