@ARTICLE{2001-SIGMOD-Saygin,
  AUTHOR = {Saygin, Y. and Verykios, V.S. and Clifton, C.},
  TITLE = {Using Unknowns to Prevent Discovery of Association Rules},
  JOURNAL = {SIGMOD Record},
  VOLUME = {30},
  NUMBER = {4},
  YEAR = {2001},
  PAGES = {45-54}
}