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Ogden, C.G., 1988b, The role of the organic matrix in the construction of the agglutinate shell of Centropyxis discoides (Rhizopoda: Protozoa): Journal of Natural History, v. 22, pp. 137-148

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Oye, P. van, 1926b, Potamoplankton de la Ruki au Congo Belge et des pays chauds en général: Internationale Revue der Gesamten Hydrobiologie und Hydrographie, v. 16, p.1-50.

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