@ARTICLE{2000-DKE-Koperski,
  AUTHOR = {Clementini, E. and Di Felice, P. and Koperski, K.},
  TITLE = {Mining multiple-level spatial association rules for objects with a broad boundary},
  JOURNAL = {Data and Knowledge Engineering},
  VOLUME = {34},
  NUMBER = {3},
  YEAR = {2000},
  PAGES = {251 - 270}
}