@Proceedings{Zeijlstra:Soehn:07,
editor =       {Hedde Zeijlstra and Jan-Philipp Soehn},
title =        {Proceedings of the Workshop on Negation and Polarity},
organization = {Collaborative Research Center 441, University of T{\"u}bingen},
url =          {http://tobias-lib.ub.uni-tuebingen.de/volltexte/2007/2791/},
year =         {2007},
}