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2. Kolsyrejämvikten i Baltiska havet;Buch;Fennia,1945
3. The seagrasses of the world;den Hartog,1970
4. Inventaire de la Flore marine de Roscoff;Feldmann,1954
5. Investigations on the phytoplankton in sheltered Danish marine localities;Grøntved;Medd. Komm. Danm. Fisk.-og Havunders., Ser. Plankton,1957