@incollection{Hoeksema:99,
  author	= {Hoeksema, Jack},
  editor	= {Gerbrandy, Jelle and Marx, Maarten and de Rijke, Maarten and Venema, Yde},
  title		= {{Blocking Effects and Polarity Sensitivity}},
  booktitle	= {{Essays Dedicated to Johan van Benthem on the Occasion of his 50th Birthday}},
  year		= {1999},
  urlpage	= {http://www.illc.uva.nl/j50/}
}