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Sterrenburg, F. A.; Tiffany, M. A.; Hinz, F.; Herwig, W. E.; Hargraves, P. E. (2015). Seven new species expand the morphological spectrum of Haslea. A comparison with Gyrosigma and Pleurosigma (Bacillariophyta). Phytotaxa. 207(2): 143-162.