%0 Journal Article %T Russians are the fastest 100-km ultra-marathoners in the world %A Beat Knechtle %A Fabio Valeri %A Pantelis Theodoros Nikolaidis %J Archive of "PLoS ONE". %D 2018 %R 10.1371/journal.pone.0199701 %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6040753/