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Siekmann, L., Röhle, G. Reference methods for the determination of steroids and uric acid by the use of isotope dilution-mass spectrometry. Z. Anal. Chem. 324, 208–209 (1986). https://doi.org/10.1007/BF00487851
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DOI: https://doi.org/10.1007/BF00487851