@inproceedings{boulicaut00approximation,
  address = {London, UK},
  author = {Boulicaut, Jean-Francois and Bykowski, Artur and Rigotti, Christophe},
  booktitle = {PKDD '00: Proceedings of the 4th European Conference on Principles
    of Data Mining and Knowledge Discovery},
  interhash = {7b3e7b0c982db3afa3b6633cade025b4},
  intrahash = {bee9235aa41ea2dd621fd477a4dd472b},
  isbn = {3-540-41066-X},
  pages = {75--85},
  publisher = {Springer-Verlag},
  title = {Approximation of Frequency Queries by Means of Free-Sets},
  year = 2000
}