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2. 1928, Neue Beiträge zur Sauerstoffschichtung der Seen. Lund.
3. 1930, Bot. Notiser. 1930, 251.
4. and , 1911, The Inland Lakes of Wisconsin. The Dissolved Gases and their Biological Significance. Wis. Geol. and Nat. Hist. Survey. Bulletin 22.