@incollection{Zwarts:96,
  author	= {Zwarts, Frans},
  editor	= {Wansing, Heinrich},
  title		= {{A Hierarchy of Negative Expressions}},
  booktitle	= {{Negation: A Notion in Focus}},
  pages		= {169--194},
  publisher	= {Mouton de Gruyter},
  address	= {Berlin and New York},
  year		= {1996}
}