International variability in 20 m shuttle run performance in children and youth: who are the fittest from a 50-country comparison? A systematic literature review with pooling of aggregate results
Justin J. Lang, Mark S. Tremblay, L Léger, Tim Olds, Grant R. Tomkinson (2016). International variability in 20 m shuttle run performance in children and youth: who are the fittest from a 50-country comparison? A systematic literature review with pooling of aggregate results. British Journal of Sports Medicine, 52(4), pp. 276-276, DOI: 10.1136/bjsports-2016-096224.
