Coastal System Analysis and Status Evaluation (BACOSA) 2015 Piepho, M., 2015, Introduction. RMB (25) S. 5 [ pdf ] Berthold, M, Zimmer, D. & Schumann, R., 2015, A simplified method for total phosphorus digestion
https://www.oekologie.uni-rostock.de/en/rostocker-meeresbiol-beitraege/rmb-25-2015/