@book {Rikken1993Utrecht,
	title = {{Soil pollution with heavy metals {\textendash}- an inquiry into spatial variation, cost of mapping and the risk evaluation of copper, cadmium, lead and zinc in the oodplains of the meuse west of Stein}},
	year = {1993},
	pages = {NA},
	publisher = {Department of Physical Geography, Utrecht University},
	organization = {Department of Physical Geography, Utrecht University},
	address = {Utrecht},
	author = {Rikken, M.G.J. and {Van Rijn}, R.P.G.}
}