F. Armin, S. Maike, K. Wolfgang, K. Gotz, and K. Beat, “No Effect of Pre Race Supplementation with Vitamins and Minerals on Performance in an Ultra-Endurance Race”, Pak. J. Nutr., vol. 7, no. 2, pp. 283–286, Feb. 2008, doi: 10.3923/pjn.2008.283.286.