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Cocquyt, C. & Vyverman, W. (1993). Surirella sparsipunctata Hustedt and S. sparsipunctata var. laevis Hustedt (Bacillariophyceae), a light and electron microscopical study. In: H. van Dam (ed.), Proceedings of the Twelfth International Diatom Symposium, Renesse, The Netherlands, 30 August - 5 September, 1992. Hydrobiologia. 269/270: 97-102.