@Article{Cravenetal00,
  author = {Craven, M. and DiPasquo, D. and Freitag, D. and McCallum, A. and Mitchell, T. and Nigam, K. and Slattery, S.},
  title  = {Learning to Construct Knowledge Bases from the World Wide Web},
  journal = {Artificial Intelligence},
  year   = {2000},
  number = {1-2},
  url    = {citeseer.nj.nec.com/craven00learning.html},

  const  = {\ text}
}
@Inproceedings{WebWatcher,
  author = {Joachims, T. and Freitag, D. and Mitchell, T.},
  title  = {Webwatcher: A tour guide for the World Wide Web},

  year   = {1997},
  number = {},
  url    = {},

  const  = {\ text}
}