Flouris, A., A. Jamurtas, I. Fatouros, and Y. Koutedakis. “Metabolic Profile of Football Athletes During Running Incorporating Different Levels of Direction Change”. Inquiries in Physical Education and Sport, vol. 13, no. 1, Mar. 2015, pp. 26-31, https://journals.lib.uth.gr/index.php/inquiries/article/view/1442.