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BONNETT, R., CANNON, J., JOHNSON, A. et al. Structure of Vitamin B12 : The Structure of Vitamin B12 and its Hexacarboxylic Acid Degradation Product. Nature 176, 328–330 (1955). https://doi.org/10.1038/176328a0
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DOI: https://doi.org/10.1038/176328a0
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