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Lu, F.J., Huang, T.S. & Lee, J.H. Effect of synthetic humic acid-multimetal complex on human plasma prothrombin time. Bull. Environ. Contam. Toxicol. 53, 577–582 (1994). https://doi.org/10.1007/BF00199029
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DOI: https://doi.org/10.1007/BF00199029