@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} }