[1]
Ehrensperger, L., Knechtle, B., Rüst, C.A. and Rosemann, T. 2013. Participation and performance trends in 6-hour ultra-marathoners: A retrospective data analysis of worldwide participation from 1991-2010. Journal of Human Sport and Exercise. 8, 4 (Dec. 2013), 905–924. DOI:https://doi.org/10.4100/jhse.2013.84.03.