@article {MRRT03,
	title = {Integrating Knowledge Representation and Reasoning in Geographical},
	year = {2004},
	note = {information systems. {\em International Journal of GIS,Vol 18 (4), June }.},
	author = {Paolo Mancarella and Alessandra Raffaet{\`a} and Chiara Renso and Franco Turini}
}
