@article {Hirzel2002Ecomodel,
	title = {{Which is the optimal sampling strategy for habitat suitability modelling}},
	journal = {Ecological Modelling},
	volume = {157},
	number = {2-3},
	year = {2002},
	pages = {331-341},
	author = {Hirzel, A.~H. and Guisan, A.}
}