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Novais, M. H.; Jüttner, I.; Vijver, B. V. D.; Morais, M. M.; Hoffmann, L.; Ector, L.

Morphological Variability Within the Achnanthidium minutissimum Species Complex (Bacillariophyta): Comparison Between the Type Material of Achnanthes minutissima and Related Taxa, and New Freshwater Achnanthidium Species from Portugal

. Phytotaxa 2015, 224, 101–139.