@incollection{Ladusaw:96,
  author	= {Ladusaw, William A.},
  editor	= {Lappin, Shalom},
  title		= {{Negation and Polarity Items}},
  booktitle	= {{The Handbook of Contemporary Semantic Theory}},
  publisher	= {Oxford: Blackwell Publishers},
  year		= {1996},
  pages		= {321--341}
}