Nygaard, G. (1956). Ancient and Recent Flora of Diatoms and Chrysophyceae in Lake Gribsø. In: Kaj Berg and Ib Clemens Petersen (eds.), Studies on the Humic, Acid Lake Gribso. Folia Limnologica Scandinavica, 8: 32-94, 12 pls.
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Nygaard, G.
1956
Ancient and Recent Flora of Diatoms and Chrysophyceae in Lake Gribsø
In: Kaj Berg and Ib Clemens Petersen (eds.), Studies on the Humic, Acid Lake Gribso. Folia Limnologica Scandinavica