↑ Lower Viruan (Middle Ordovician) conodonts from the Gullhögen quarry, southern central Sweden. LE Fåhræus, 1966, Sveriges geologiska undersökning
↑ A septimembrate apparatus model for the Ordovician conodont genus Cornuodus Fahraeus, 1966. Anita M. Lofgren, Bollettino della Società Paleontologica Italiana, 37(2), pages 175-186, January 1998
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