@book{67053,
	author = {Beek, Klaas Jan. and Burrough, Peter A. and E.U.A. Department of Agriculture.},
	title = {Quantified land evaluation procedures},
	publisher = {International Institute for Aerospace Survey and Earth,},
	year = {1987},
	series = {ITC publication},
	address = {Enschede, The Netherlands :}
}