1. WADA TD2016 IRMS-detection of synthetic forms of endogenous anabolic androgenic steroids by GC-C-IRMS 2016 https://wada-main-prod.s3.amazonaws.com/resources/files/wada-td2016irms-detection_synthetic_forms_eaas_by_irms-en.pdf
2. WADA The World Anti-Doping Code - The 2018 Prohibited List International Standard 2018 https://www.wada-ama.org/sites/default/files/prohibited_list_2018_en.pdf
3. Two categories of c/c ratios for higher plants;Smith;Plant Physiol,1971
4. Carbon isotope fractionation in plants;O'Leary;Phytochemistry,1981
5. Carbon isotope ratio ([delta]13C) values of urinary steroids for doping control in sport;Cawley;Steroids,2009