@ARTICLE{KAIS16, 
	author = {Giuseppe Della Penna and  Daniele Magazzeni and  Sergio Orefice},
	title = {A Formal Framework to Represent Spatial Knowledge}, 
	doi = {10.1007/s10115-016-0975-3},
	journal = {Knowledge and Information Systems},
	editor = {Springer},

	pages = {311--338},
	year = {2017},
	month = {4},
	volume = {51},
	number = {1}
	
}