@article {Kempen2009Geoderma,
	title = {{Updating the 1:50,000 Dutch soil map using legacy soil data: A multinomial logistic regression approach}},
	journal = {Geoderma},
	volume = {151},
	number = {3-4},
	year = {2009},
	pages = {311-326},
	doi = {http://dx.doi.org/10.1016/j.geoderma.2009.04.023},
	author = {Kempen, B. and Brus, D.J. and Heuvelink, G.B.M. and Stoorvogel, J.J.}
}