@article {Urban2001,
	title = {Landscape connectivity: a graph-theoretic perspective},
	journal = {Ecology},
	volume = {82},
	year = {2001},
	pages = {1205{\textendash}1218},
	url = {http://www.esajournals.org/doi/abs/10.1890/0012-9658(2001)082[1205:LCAGTP]2.0.CO;2},
	author = {Urban, D and Keitt, T}
}
