U. & Schubert, H., 2009, The German procedure for the assessment of ecological status in relation to the biological quality element "Macroalgae & Angiosperms" pursuant to the European Water Framework Directive [...] Directive (WFD) for inner coastal waters of the Baltic Sea. RMB (22) S. 7–42 [ pdf ] Haupt, H. & Ludwig, G., 2009, Zur Realisierbarkeit einer neuen Roten Liste der Armleuchteralgen (Characeen) Deutschlands [...] Antworten auf van de Weyer et al . (2008). RMB (22) S. 43–52 [ pdf ] van Raam, J., 2009, A matrix key for the determination of Characeae. RMB (22) S. 53–55 [ pdf ] appendant matrices (MS Excel files): charbaltic
https://www.oekologie.uni-rostock.de/en/rostocker-meeresbiol-beitraege/rmb-22/