Pont, D., Hugueny, B., Beier, U., Goffaux, D., Melcher, A., Noble, R., …Schmutz, S. (2006). Assessing river biotic condition at a continental scale: a European approach using functional metrics and fish assemblages. The JOURNAL OF APPLIED ECOLOGY, 43(1), 70-80. https://doi.org/10.1111/j.1365-2664.2005.01126.x