Agapov, D., Krovykov, V., Boyko, U. and Hodorchenko, V. 2013. Method of estimation of technical preparedness level of baseballs aged 12-14 years. Physical Education of Students. 17, 2 (Apr. 2013), 3–10. DOI:https://doi.org/10.6084/m9.figshare.156373.