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journalAt: Precambrian research, 21, 3-4 By: McMenamin D. L. S., Kumar S., Awramik S. M.
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journalAt: Palaeobotanist, 1983, 32, 1 By: Mandal J. P., Maithy P. K., Barman G., Verma K. K.
journalAt: Precambrian research, 65 By: Yin L.-M., Sun W.-G.