Vaso, M., Knechtle, B., Rüst, C. A., Rosemann, T. and Lepers, R. (2013) “Age of peak swim speed and sex difference in performance in medley and freestyle swimming: A comparison between 200 m and 400 m in Swiss elite swimmers”, Journal of Human Sport and Exercise, 8(4), pp. 954–965. doi: 10.4100/jhse.2013.84.06.