Reference

Ronald Böttcher, Christopher J. Duffin (2000): The neoselachian shark Sphenodus from the Late Kimmeridgian (Late Jurassic) of Nusplingen and Egesheim (Baden-Württemberg, Germany) – Stuttgarter Beiträge Naturkunde Serie B [Paläontologie] – 283_B: 1 - 31.