Іващенко, О., and Г. Шепеленко. “Comparative Characteristics of Coordination Fitness and Power of Middle Class”. Teorìâ Ta Metodika Fìzičnogo Vihovannâ, no. 2, June 2014, pp. 22-30, doi:https://doi.org/10.17309/tmfv.2014.2.1096.