Mark O. Hill, David B. Roy, J. Owen Mountford, Robert G. H. Bunce: Extending Ellenberg's Indicator Values to a New Area: An Algorithmic Approach. In: Journal of Applied Ecology. Band37, Nr.1, 2000, ISSN0021-8901, S.3–15 (wiley.com [PDF; abgerufen am 16. Juni 2022]).
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Mark O. Hill, David B. Roy, J. Owen Mountford, Robert G. H. Bunce: Extending Ellenberg's Indicator Values to a New Area: An Algorithmic Approach. In: Journal of Applied Ecology. Band37, Nr.1, 2000, ISSN0021-8901, S.3–15 (wiley.com [PDF; abgerufen am 16. Juni 2022]).