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European Journal of Clinical Chemistry and Clinical Biochemistry : Journal of the Forum of European Clinical Chemistry Societies|April 1, 1991
Reference methods for total cholesterol and total glycerolL SiekmannBiomedical & Environmental Mass Spectrometry|November 1, 1987
Measurement of thyroxine in human serum by isotope dilution mass spectrometry. Definitive methods in clinical chemistry, VL SiekmannJournal of Clinical Chemistry and Clinical Biochemistry. Zeitschrift Fur Klinische Chemie Und Klinische Biochemie|August 1, 1984
Determination of oestradiol-17 beta in human serum by isotope dilution-mass spectrometry. Definitive methods in clinical chemistry, IIL SiekmannJournal of Clinical Chemistry and Clinical Biochemistry. Zeitschrift Fur Klinische Chemie Und Klinische Biochemie|March 1, 1985
Determination of uric acid in human serum by isotope dilution-mass spectrometry. Definitive methods in clinical chemistry, IIIL SiekmannJournal of Clinical Chemistry and Clinical Biochemistry. Zeitschrift Fur Klinische Chemie Und Klinische Biochemie|March 1, 1985
Determination of creatinine in human serum by isotope dilution-mass spectrometry. Definitive methods in clinical chemistry, IVL SiekmannJournal of Clinical Chemistry and Clinical Biochemistry. Zeitschrift Fur Klinische Chemie Und Klinische Biochemie|December 1, 1982
Determination of cortisol in human plasma by isotope dilution-mass spectrometry. Definitive methods in clinical chemistry, IL Siekmann, H BreuerClinical Chemistry|September 3, 1999
Measurement of urea in human serum by isotope dilution mass spectrometry: a reference procedureA Kessler, L SiekmannBiomedical Mass Spectrometry|November 1, 1980
Measurement by isotope dilution mass spectrometry of 17 alpha-ethynyloestradiol-17 beta and norethisterone in serum of women taking oral contraceptivesL Siekmann, A Siekmann, H BreuerActa Endocrinologica|September 1, 1980
Biosynthesis of 16 alpha, 17 alpha-epoxy-oestratrienol in rat liver microsomesL Siekmann, P Thull, H BreuerActa Endocrinologica|September 1, 1980
Biosynthesis of 16 alpha, 17 alpha-epoxy-4-androsten-3-one in rat liver microsomesB Disse, L Siekmann, H BreuerPageof 3