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2. Open nomenclature;Bengtson;Palaeontology,1988
3. Isolated sclerites of Devonian non-pelmatozoan echinoderms;Boczarowski;Palaeontologia Polonica,2001
4. A Derbyshire screwstone (Mississippian) from the beach at Overstrand, Norfolk, eastern England;Donovan;Scripta Geologica Special Issue,2010
5. Taphonomy and significance of rare chalk (Late Cretaceous) echinoderms preserved as beach clasts, north Norfolk, UK