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Evans, D. H.; King, A. H. (1990). The affinities of early oncocerid nautiloids from the Lower Ordovician of Spitsbergen and Sweden. Palaeontology. 33: 623–630.
Evans, D. H.; King, A. H. (1990). The affinities of early oncocerid nautiloids from the Lower Ordovician of Spitsbergen and Sweden. Palaeontology. 33: 623–630.
