@article {DBLP:journals/tkde/GiannottiMT04, title = {Specifying Mining Algorithms with Iterative User-Defined Aggregates}, journal = {IEEE Trans. Knowl. Data Eng.}, volume = {16}, number = {10}, year = {2004}, pages = {1232-1246}, author = {Fosca Giannotti and Giuseppe Manco and Franco Turini} }