South African Journal of ScienceOn-line version ISSN 1996-7489
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BRAIN, C.K. 'Bob' et al. The first animals: ca. 760-million-year-old sponge-like fossils from Namibia. S. Afr. j. sci. [online]. 2012, vol.108, n.1-2, pp. 01-08. ISSN 1996-7489.
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