Caffeine supplementation does not affect match activities and fatigue resistance during match play in young football players - Pettersen, S A; Krustrup, P; Bendiksen, M; Randers, M B; Brito, J; Bangsbo, J; Jin, Y; Mohr, M (J Sports Sci, 2014)
doi:10.1080/02640414.2014.965189: