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This research has been supported by the Natural Environment Research Council, the Royal Society, and the USSR Academy of Sciences.
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Riding, R., Voronova, L. Calcified cyanophytes and the precambrian-cambrian transition. Naturwissenschaften 69, 498–499 (1982). https://doi.org/10.1007/BF00365820
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DOI: https://doi.org/10.1007/BF00365820