@article {DeGruijter1997Geoderma,
	title = {{Continuous soil maps {\textendash}- a fuzzy set approach to bridge the gap between aggregation levels of process and distribution models}},
	journal = {Geoderma},
	volume = {77},
	number = {2-4},
	year = {1997},
	pages = {169-195},
	author = {{de Gruijter}, J.~J. and Walvoort, D.~J.~J. and van Gaans, P.~F.~M.}
}