Perspectives on the Nature and Definition of Ecological Regions. Omernik, J. M. Environmental Management, 34(S1):S27–S38, April, 2004.
Perspectives on the Nature and Definition of Ecological Regions [link]Paper  doi  bibtex   
@article{omernik_perspectives_2004,
	title = {Perspectives on the {Nature} and {Definition} of {Ecological} {Regions}},
	volume = {34},
	issn = {0364-152X, 1432-1009},
	url = {http://link.springer.com/10.1007/s00267-003-5197-2},
	doi = {10.1007/s00267-003-5197-2},
	language = {en},
	number = {S1},
	urldate = {2023-09-21},
	journal = {Environmental Management},
	author = {Omernik, James M.},
	month = apr,
	year = {2004},
	keywords = {notion},
	pages = {S27--S38},
}

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