@article {McBratney1992Geoderma,
	title = {{Spatial prediction and mapping of continuous soil classes}},
	journal = {Geoderma},
	volume = {54},
	number = {1-4},
	year = {1992},
	pages = {39-64},
	author = {McBratney, A.~B. and {de Gruijter}, J.~J. and Brus, D.~J.}
}