Molecular components of dissolved organic matter distinguished by optical properties and HPLC in the sediments of Lake Tõugjärv, Southern EstoniaLepane, Viia; Makarõtševa, Natalja; Alliksaar, TiiuGeophysical research abstracts2009 / p. 12450https://meetingorganizer.copernicus.org/EGU2009/EGU2009-12450.pdf