@Book{		  dixlob99,
  editor	= {J\"{u}rgen Dix and Jorge Lobo},
  title		= {{L}ogic {P}rogramming and Non-monotonic Reasoning},
  publisher	= {Baltzer Science Publishers},
  series	= {{S}pecial Issue of the Annals in Mathematics and
		  Artificial Intelligence},
  volume	= {25 (3--4)},
  pages		= {161--419},
  year		= {1999}
}