Niehaus, Andreas. „Abstracts of the 7th Annual Conference of the Committee for Martial Arts Studies in the German Association of Sport Science in Ghent 2018“. Journal of Martial Arts Research 2, no. 2 (April 14, 2019): 38. Zugegriffen Januar 28, 2022. https://openjournals.uni-bayreuth.de/index.php/jomar/article/view/90.