@article {Engler2004JAE,
	title = {{An improved approach for predicting the distribution of rare and endangered species from occurrence and pseudo-absence data}},
	journal = {Journal of Applied Ecology},
	volume = {41},
	number = {2},
	year = {2004},
	pages = {263-274},
	author = {Engler, R. and Guisan, A. and Rechsteiner, L.}
}