Quantification of species as functional units within an ecological network

Pahl-Wostl C & Ulanowicz RE
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Pahl-Wostl, C., & Ulanowicz, R. E. (1993). Quantification of species as functional units within an ecological network. Ecological Modelling, 66(1-2), 65-79. https://doi.org/10.1016/0304-3800(93)90039-U