@article {Hengl2004Geoderma,
	title = {{A generic framework for spatial prediction of soil variables based on regression-kriging}},
	journal = {Geoderma},
	volume = {122},
	number = {1-2},
	year = {2004},
	pages = {75-93},
	author = {Hengl, T. and Heuvelink, G.~M.~B. and Stein, A.}
}