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In soil, the existence of humic substances has not been verified by direct measurements. MWI Schmidt et al. Nature 478 , 49 - 56 (2011) doi:10.1038/nature10386.
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In soil, the existence of humic substances has not been verified by direct measurements. MWI Schmidt et al. Nature478, 49-56 (2011) doi:10.1038/nature10386