Nolan, Rory, Richard Usher, and Neil Heron. “An Overview of the Athlete’s Biological Passport (ABP) in Professional Road Cycling and Causes of Natural Variation Within the ABP”. Journal of Science and Cycling 8, no. 3 (December 31, 2019): 3-8. Accessed April 20, 2024. https://www.jsc-journal.com/index.php/JSC/article/view/438.