Rantajärvi, E.; Olsonen, R.; Hällfors, S.; Leppänen, J.-M.; Raateoja, M. (1998). Effect of sampling frequency on detection of natural variability in phytoplankton: unattended high-frequency measurements on board ferries in the Baltic Sea. ICES J. Mar. Sci./J. Cons. int. Explor. Mer 55(4): 697-704, more
Olsonen, R. (2008). FIMR monitoring of the Baltic Sea environment - Annual Report 2007. MERI Report Series, 62. Finnish Institute for Marine Research: Finland. 111 pp., more