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Drug Testing and Analysis|April 1, 2010
13C/12C ratios of endogenous urinary steroids investigated for doping control purposesThomas Piper, Ulrich Flenker, Ute Mareck, et al.Drug Testing and Analysis|May 4, 2011
Investigations on changes in ¹³C/¹²C ratios of endogenous urinary steroids after pregnenolone administrationThomas Piper, Christoph Schlug, Ute Mareck, et al.Journal of Mass Spectrometry : JMS|June 4, 2005
Screening for unknown synthetic steroids in human urine by liquid chromatography-tandem mass spectrometryMario Thevis, Hans Geyer, Ute Mareck, et al.Therapeutic Drug Monitoring|April 10, 2007
Doping-control analysis of the 5alpha-reductase inhibitor finasteride: determination of its influence on urinary steroid profiles and detection of its major urinary metaboliteMario Thevis, Hans Geyer, Ute Mareck, et al.Journal of Mass Spectrometry : JMS|June 24, 2008
Factors influencing the steroid profile in doping control analysisUte Mareck, Hans Geyer, Georg Opfermann, et al.Foods (Basel, Switzerland)|July 31, 2020
Dietary Supplement and Food Contaminations and Their Implications for Doping ControlsKatja Walpurgis, Andreas Thomas, Hans Geyer, et al.European Journal of Mass Spectrometry (Chichester, England)|April 18, 2008
Detection of dehydroepiandrosterone misuse by means of gas chromatography- combustion-isotope ratio mass spectrometryUte Mareck, Hans Geyer, Ulrich Flenker, et al.Journal of Sports Sciences|July 9, 2008
Determination of the prevalence of anabolic steroids, stimulants, and selected drugs subject to doping controls among elite sport students using analytical chemistryMario Thevis, Michael Sauer, Hans Geyer, et al.Biomedical Chromatography : BMC|December 6, 2006
High amounts of 17-methylated anabolic-androgenic steroids in effervescent tablets on the dietary supplement marketMaria K Parr, Hans Geyer, Bernhard Hoffmann, et al.Journal of Mass Spectrometry : JMS|June 20, 2008
Nutritional supplements cross-contaminated and faked with doping substancesHans Geyer, Maria Kristina Parr, Karsten Koehler, et al.Pageof 2