Helm, N., Prieske, O., Mühlbauer, T., Krüger, T., Chaabène, H., & Granacher, U. (2018). Validation of a new judo-specific ergometer system in male elite and sub-elite athletes. Journal of sports science and medicine, 17(3), S. 465-474. https://www.jssm.org/hf.php?id=jssm-17-465.xml

Helm, Norman, Olaf Prieske, Thomas Mühlbauer, Tom Krüger, Helmi Chaabène, and Urs Granacher. "Validation of a New Judo-specific Ergometer System in Male Elite and Sub-elite Athletes." Journal of Sports Science and Medicine 17, no. 3 (2018): S. 465-474.

Helm, Norman, et al. "Validation of a New Judo-specific Ergometer System in Male Elite and Sub-elite Athletes." Journal of Sports Science and Medicine 17.3 (2018): S. 465-474.