Effect of cooper on growth rate, cell shape, motility and photosynthesis in the green flagellate Euglena gracilis in a long-term experiment / Roman A. Danilov, Nils G.A. Ekelund. Biologia. Section A. Section B. Section C, Botany. Zoology. Cellular and molecular biology Roč. 55, č. 4 (2000), s. 413-418