Knechtle, B., Eichenberger, E., Rüst, C. A., Lepers, R., Rosemann, T. and 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), pp. 748–762. doi: 10.4100/jhse.2012.74.03.