@inproceedings{KDD-2009-FrankEK,
	author        = "Richard Frank and Martin Ester and Arno J. Knobbe",
	booktitle     = "{Proceedings of the 15th International Conference on Knowledge Discovery and Data Mining}",
	doi           = "10.1145/1557019.1557058",
	isbn          = "978-1-60558-495-9",
	pages         = "309--318",
	publisher     = "{ACM}",
	title         = "{A multi-relational approach to spatial classification}",
	year          = 2009,
}