Solovey, O., V. Hunchenko, D. Solovey, and K. Wnorowski. “Influence of Static Balances Level on Competitive Performance Indicators of Athletes 17-21 Years Old in Beach Volleyball”. Physical Education of Students, Vol. 24, no. 6, Dec. 2020, pp. 332-9, doi:10.15561/20755279.2020.0605.