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Cárdenas, P.; Rapp, H.T.: Klitgaard, A.B.; Best, M.; Thollesson, M.; Tendal, O.S. (2013). Taxonomy, biogeography and DNA barcodes of Geodia species (Porifera, Demospongiae, Tetractinellida) in the Atlantic boreo-arctic region. Zoological Journal of the Linnean Society. 169, 251-311.