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Sommers, C. D., & Keire, D. A. (2011). Detection of Possible Economically Motivated Adulterants in Heparin Sodium and Low Molecular Weight Heparins with a Colorimetric Microplate Based Assay. Analytical Chemistry, 83(18), 7102–7108. doi:10.1021/ac201412z 
10.1021/ac201412z