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Werum, M. & Lange-Bertalot, H. (2004). Diatoms in Springs from Central Europe and elsewhere under the influence of hydrologeology and anthropogenic impacts. In: H. Lange-Bertalot (ed.), Iconographia Diatomologica. Annotated Diatom Micrographs. Vol. 13. Ecoloy-Hydrology-Taxonomy. A.R.G. Gantner Verlag K.G. 13: pp. 3-417, 105 pls.