Carstensen, J., Andersen, J. & Murray, C. (2016).
Combining indicators and BQEs. I M. Lindegarth, J. Carstensen, S. Drakare, R. K. Johnson, A. Nyström Sandmann, A. Söderpalm & S. A. Wikström (red.),
Ecological assessment of Swedish water bodies: Development, harmonization and integration of biological indicators. Final report of the research programme WATERS. Deliverable 1.1-4, WATERS report no 2016:10 (s. 150-156). Havsmiljöinstitutet .
http://waters.gu.se/digitalAssets/1591/1591380_rapport-waters_160929.pdf