Zart, S., C. Dindorf, and M. Fröhlich. “Ergogenic Effects of the Combination of Caffeine and New Zealand Blackcurrant Supplements on Time Trial: A Double-Blind Single-Case Experimental Study”. Scientific Journal of Sport and Performance, vol. 3, no. 2, Jan. 2024, pp. 145-59, doi:10.55860/ENNP5024.