@article {Hengl2007CG,
	title = {{About regression-kriging: from theory to interpretation of results}},
	journal = {Computers \& Geosciences},
	volume = {33},
	number = {10},
	year = {2007},
	pages = {1301-1315},
	author = {Hengl, T. and Heuvelink, G.~B.~M. and Rossiter, D.~G.}
}