@ARTICLE{Hearst,
  author = {Marti Hearst },
  title   = {Automatic Acquisition of Hyponyms from Large Text Corpora.},
  journal = {Proc. of the
Fourteenth International Conference on Computational Linguistics, Nantes, France.},
  year    = {1992}
}


@ARTICLE{Bootstrap,
  author = {Daniel Waegel},
  title   = {A Survey of Bootstrapping Techniques in Natural Language Processing},
  journal = {Department of Computer Science,
University of Delaware, Literature Survey Reports},
  year    = {2013}
}