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Sengbusch PV (2003-07-31). "Cell Walls of Algae". Botany Online. biologie.uni-hamburg.de. Archived from the original on November 28, 2005. Retrieved 2007-10-29.
Becker B (2000). "The cell surface of flagellates.". In Leadbeater BS, Green JC (eds.). The Flagellates. Unity, diversity and evolution. London: Taylor and Francis. Archived from the original on 2013-02-12.