@Book{		  bredixkon93,
  author	= {Gerd Brewka and J\"{u}rgen Dix and Kurt Konolige},
  title		= {{N}onmonotonic {R}easoning: {A}n {O}verview},
  publisher	= {CSLI Publications},
  year		= {1997},
  address	= {Stanford, CA},
  series	= {CSLI Lecture Notes 73}
}