@article {Minasny2005Geoderma,
	title = {{The Mat{\'e}rn function as a general model for soil variograms}},
	journal = {Geoderma},
	volume = {128},
	number = {3-4},
	year = {2005},
	pages = {192-207},
	author = {Minasny, B. and McBratney, A.~B.}
}