1. Hydrology of the Baltic Sea;Ehlin,1981
2. Biological oceanography;Hällfors,1981
3. Revision of the European Species of Cladophora;Hoek,1963
4. Major ion and carbonate system chemistry of a navigable canal;Howard;Freshwater Biology,1984
5. Natural systems of the Baltic Sea;Jansson;Ambio,1980