@InProceedings{	  dixoso97on,
  author	= {J\"{u}rgen Dix and Mauricio Osorio},
  title		= {On {W}ell-{B}ehaved {S}emantics {S}uitable for
		  {A}ggregation},
  pages		= {505},
  publisher	= {MIT Press},
  editor	= {Jan Maluszynski},
  booktitle	= {Logic Programming: Proceedings of the 1997 International
		  Symposium},
  year		= {1997}
}