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[3]DES MARAIS D J, STRAUSS H, SUMMONS R E, et al. Carbon isotope evidence for the stepwise oxidation of the Proterozoic environment [J]. Nature, 1992, 359: 605-609. [4]HEWITT J A. Technical services in 1983[J]. Library Resource Services, 1984, 28(3): 205-218. ................
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