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LOVE, L. G. 1963. The composition of Pyritosphaera barbaria Love 1957. Palaeontology, 6, 1, 119–120.
Leonard G. Love A bulk sample of Pyritosphaera barbaria Love 1957 is shown by microchemical analysis, following other indications, to be dominantly organic in composition. The Palaeontological Association (Free Access)