Running performance, nationality, sex, and age in the 10-km, half-marathon, marathon, and the 100-km ultramarathon IAAF 1999-2015 - Nikolaidis, P. T.; Onywera, V. O.; Knechtle, B. (The Journal of Strength and Conditioning Research, 2017)
Keywords: long distance running; marathon running; track and field; development; performance development; performance; sex; age; country; USA; endurance sports