Determination of 13C/12C ratios of urinary excreted boldenone and its main metabolite 5beta-androst-1-en-17beta-ol-3-one

von Piper, Thomas (Autor), ... Geyer, Hans (Autor), Gougoulidis, Vassilios (Autor), Flenker, Ulrich (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Drug testing and analysis, 2 (2010), 5, S. 217–224, Lit.

Elucidation of original and metabolic sources of ephedrines by stable isotope analysis

von Flenker, Ulrich (Autor), ... Hülsemann, Frank (Autor), Gougoulidis, Vassilios (Autor), Sigmund, Gerd (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Recent advances in doping analysis (15) : Proceedings of the Manfred Donike Workshop ; 25th Cologne Workshop on Dope Analysis ; 25th February to 2nd March 2007, Köln: Sportverl. Strauß (Verlag), 2007, S. 209-216, Lit.

Intracrine androgen metabolism : fundamentals and a new approach to make use of 13C/12C signals of endogenous steroids

von Flenker, Ulrich (Autor), ... Riemann, Phillip (Autor), Hülsemann, Frank (Autor), Gougoulidis, Vassilios (Autor), Thevis, Mario (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Recent advances in doping analysis (26) : Proceedings of the Manfred Donike Workshop ; 36th Cologne Workshop on Dope Analysis ; 23rd to 26th April 2018, Hellenthal: Sportverl. Strauß (Verlag), 2018, S. 36-42, Lit.

Doping control analysis of metamfepramone and two major metabolites using liquid chromatography-tandem mass spectrometry

von Thevis, Mario (Autor), ... Sigmund, Gerd (Autor), Thomas, Andreas (Autor), Gougoulidis, Vassilios (Autor), Rodchenkov, Grigory (Autor), Schänzer, Wilhelm (Autor)
Erschienen in European journal of mass spectrometry, 15 (2009), 4, S. 507-515, Lit.

Additional investigations in connection with atypical findings for 19-norandrosterone : a case study

von Fußhöller, Gregor (Autor), ... Geyer, Hans (Autor), Haenelt, Nadine (Autor), Hülsemann, Frank (Autor), Gougoulidis, Vassilios (Autor), Blatt, Christina (Autor), Thevis, Mario (Autor)
Erschienen in Recent advances in doping analysis (29) : Proceedings of the Manfred Donike Workshop ; 39th Cologne Workshop on Dope Analysis 22nd to 26th March 2021, Hellenthal: Sportverl. Strauß (Verlag), 2021, S. 38-40, Lit.

Case Study : atypical δ13C values of urinary norandrosterone

von Hülsemann, Frank (Autor), ... Gougoulidis, Vassilios (Autor), Schertel, Thomas (Autor), Fußhöller, Gregor (Autor), Flenker, Ulrich (Autor), Piper, Thomas (Autor), Thevis, Mario (Autor)
Erschienen in Drug testing and analysis, 10 (2018), 11/12 (36th Cologne workshop: Advances in sports drug testing), S. 1728-1733, Lit.

The ratio 5aAdiol/E as indicator for the detection of testosterone doping in athletes with naturally low T/E : a case study

von Geyer, Hans (Autor), ... Fußhöller, Gregor (Autor), Haenelt, Nadine (Autor), Mareck, Ute (Autor), Blatt, Christina (Autor), Gougoulidis, Vassilios (Autor), Hülsemann, Frank (Autor), Piper, Thomas (Autor), Thevis, Mario (Autor)
Erschienen in Recent advances in doping analysis (28) : Proceedings of the Manfred Donike Workshop ; 38th Cologne Workshop on Dope Analysis 9th to 14th February 2020, Hellenthal: Sportverl. Strauß (Verlag), 2020, S. 90-93, Lit.

Follow-up investigations of atypical passport findings for the ratio 5a-Androstane-3a,17b-diol/5b-Androstane-3a,17b-diol

von Haenelt, Nadine (Autor), ... Lourens, L. (Autor), Fußhöller, Gregor (Autor), Geyer, Hans (Autor), Goldmann, Linda (Autor), Schult, Claudia (Autor), Schwenke, Anne (Autor), Hülsemann, Frank (Autor), Gougoulidis, Vassilios (Autor), Blatt, Christina (Autor), Thevis, Mario (Autor)
Erschienen in Recent advances in doping analysis (29) : Proceedings of the Manfred Donike Workshop ; 39th Cologne Workshop on Dope Analysis 22nd to 26th March 2021, Hellenthal: Sportverl. Strauß (Verlag), 2021, S. 34-37, Lit.