@incollection{Wille82,
  author	= {Wille, Rudolf},
  editor	= {Rival, I.},
  year		= {1982},
  title		= {Restructuring lattice theory: an approach based on hierarchies of concept},
  booktitle	= {Ordered Sets},
  pages		= {445--470},
  publisher	= {Reidel},
  address	= {Dordecht/Boston}
}