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Oellerich, M., Haeckel, R. & Külpmann, W.R. Identification of drugs of abuse in urine by enzyme immunoassay (Emit) and thin-layer chromatography (Drug Skreen). A comparative study. Z. Anal. Chem. 279, 132 (1976). https://doi.org/10.1007/BF00440800
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DOI: https://doi.org/10.1007/BF00440800