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Issa, I.M., Aly, M.M. Spectrophotometric determination of trace amounts of cobalt using 7-Nitroso-8-hydroxyquinoline-5-sulphonic acid as reagent. fresenius Z Anal Chem 266, 127 (1973). https://doi.org/10.1007/BF00424072
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DOI: https://doi.org/10.1007/BF00424072