Іващенко, О. В., А. В. Коптенков, and Д. О. Прокопенков. “Factor Model of Motor and Functional Readiness of Girls Aged 15-16 Years”. Physical Education Theory and Methodology, no. 3, Sept. 2015, pp. 3-16, doi:10.17309/tmfv.2015.3.1143.