{"id":"000027312","type":"book","title":"A method for the determination of free silica in lake sediments by use of X-ray emission spectroscopy","publisher-place":"Stuttgart","pages":"194-201","container-title":"Archiv für Hydrobiologie, 63. 1967, No. 2","author":[{"family":"Cowgill","given":"Ursula M."}],"issued":{"raw":"1967"}}