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Vorstman, A.G. (1954). VII. Spongiaria en Bryozoa. In: Beaufort, L.F. De. (1954). Veranderingen in de Flora en Fauna van de Zuiderzee (thans IJsselmeer) na de Afsluiting in 1932. C. de Boer Jr., Amsterdam (in Dutch). Pp. 156-157.