Knechtle, B., Eichenberger, E., Rüst, C. A., Lepers, R., Rosemann, T., & Onywera, V. O. (2012). The aspect of nationality and performance in a mountain ultra-marathon: The ‘Swiss Alpine Marathon’. Journal of Human Sport and Exercise, 7(4), 748–762. https://doi.org/10.4100/jhse.2012.74.03