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  1. Martin, M. W.; Grazhdankin, D. V; Bowring, S. A; Evans, D. A; Fedonkin, M. A; Kirschvink, J. L. (5 May 2000). "Age of Neoproterozoic bilatarian [sic] body and trace fossils, White Sea, Russia: implications for metazoan evolution". Science. 288 (5467): 841–5. Bibcode:2000Sci...288..841M. doi:10.1126/science.288.5467.841. PMID 10797002.