@book{176043,
	author = {Dale, Peter.},
	title = {Introduction to mathematical techniques used in GIS /},
	publisher = {CRC Press,},
	year = {c2005.},
	address = {Boca Raton :},
	url = {http://www.loc.gov/catdir/enhancements/fy0647/2004051924-d.html}
}