@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}
}
