@article {RodriguezLado2009Geoderma,
	title = {{Heavy metals in European soils: a geostatistical analysis of the FOREGS Geochemical database}},
	journal = {Geoderma},
	volume = {148},
	year = {2009},
	pages = {189-199},
	author = {Rodriguez Lado, L. and Hengl, T. and Reuter, H.I.}
}