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Rawat, J.P., Singh, J.P. & Bhattacharjee, P. Spectrophotometric determination of picric acid with zinc and ammonium chloride. Z. Anal. Chem. 293, 416 (1978). https://doi.org/10.1007/BF00471468
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DOI: https://doi.org/10.1007/BF00471468