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2. Early Cambrian button-shaped phosphatic microfossils from the Siberian platform;Bengtson;Palaeontology,1977
3. A comparative study of Lower Cambrian Halkieria and Middle Cambrian Wiwaxia
4. Coeloscleritophora—a major group of enigmatic Cambrian metazoans;Bengtson;United States Geological Survey Open File Report,1981
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