@book{36542,
	author = {Humphrys, Graham. and Williams, Michael. and SpringerLink (Online service)},
	title = {Presenting and Representing Environments},
	publisher = {Springer Netherlands,},
	year = {2005.},
	series = {The GeoJournal Library,},
	address = {Dordrecht :},
	url = {http://dx.doi.org/10.1007/1-4020-3814-3}
}