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The authors thank Dr. J. Connan [Société Nationale Elf Aquitaine (Production), Pau, France] for a sample of Julia Creek oil shale and helpful discussions; they also thank the Petroleum Research Fund (PRF 19791-AC2) for financial support.
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Ocampo, R., Callot, H.J., Albrecht, P. et al. Different isotope compositions of C32 DPEP and C32 etioporphyrin III in oil shale. Naturwissenschaften 76, 419–421 (1989). https://doi.org/10.1007/BF00366165
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DOI: https://doi.org/10.1007/BF00366165