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Morales, A., Valladares, L. Extraction-spectrophotometric determination of microamounts of copper as the ternary bis-(2,2′-biquinolyl)-copper(I) picrate complex. Z. Anal. Chem. 334, 53–55 (1989). https://doi.org/10.1007/BF00481973
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DOI: https://doi.org/10.1007/BF00481973