@incollection{Clark:1978,
  added-at = {2007-12-14T02:37:27.000+0100},
  address = {New York, London},
  author = {Clark, Keith L.},
  biburl = {http://www.bibsonomy.org/bibtex/2d26f2af670588b3aab3c07dd37835058/diego_ma},
  booktitle = {Logic and Data Bases},
  editor = {Minker, Jack},
  interhash = {6cf8049ef6f1589680af5777f81b0bed},
  intrahash = {d26f2af670588b3aab3c07dd37835058},
  keywords = {logic},
  pages = {293-322},
  publisher = {Plenum Press},
  timestamp = {2007-12-14T02:37:27.000+0100},
  title = {Negation as failure},
  volume = 1,
  year = 1978
}