Paper  bibtex   

@misc{hargrove_locating_1999,
	title = {Locating and {Characterizing} the {Borders} {Between} {Ecoregions} {Using} {Multivariate} {Geographic} {Clustering}},
	url = {https://www.geobabble.org/~hnw/borders/},
	urldate = {2023-07-05},
	author = {Hargrove, William W. and Hoffman, Forrest M.},
	month = jun,
	year = {1999},
	keywords = {Terrestrial Ecoregions (CEC 1997)},
}