@inproceedings{VanLehn:1998,
  added-at = {2007-12-14T02:47:33.000+0100},
  address = {Hillsdale, NJ},
  author = {VanLehn, Kurt and Siler, Stephanie and Murray, Charles and Baggett, William B.},
  biburl = {http://www.bibsonomy.org/bibtex/2af6ead97105924c7118f9e9ee4ccb7b9/diego_ma},
  booktitle = {Proc. of the Twenth-first Annual Conference of the Cognitive Science Society},
  editor = {Gernsbacher, M. A. and Derry, S.},
  interhash = {af346fc2e5f378b463734938ec36d0d6},
  intrahash = {af6ead97105924c7118f9e9ee4ccb7b9},
  keywords = {tutoring_system},
  note = {To be published?},
  publisher = {Erlbaum},
  timestamp = {2007-12-14T02:47:33.000+0100},
  title = {What Makes a Tutorial Event Effective?},
  year = 1998
}