@InCollection{arec:99jfak, 
  author={Carlos Areces and Christof Monz and Hans de~Nivelle
         and Maarten de~Rijke}, 
  title={The Guarded Fragment: Ins and Outs}, 
  booktitle = {{JFAK}. Essays Dedicated to Johan
      van Benthem on the Occasion of his 50th Birthday},
  publisher = {Vossiuspers,
      Amsterdam University Press},
  year = 1999
}