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Janssen, A. W., King, C. & Steubaut, E. (2011). Notes on the systematics, morphology and biostratigraphy of fossil holoplanktonic Mollusca, 21. Early and middle Eocene (Ypresian-Lutetian) holoplanktonic Mollusca (Gastropoda) from Uzbekistan. Basteria. 75(4-6): 71-93.