Iermakov, Sergii, Oleg Khudolii, and Denys Chupikhin. 2021. “Discriminant Analysis: Impact of the Number of Repetitions on the Effectiveness of Teaching Boys Aged 7 Throwing a Small Ball”. Journal of Learning Theory and Methodology 2 (2). Kharkiv, Ukraine:75-81. https://doi.org/10.17309/jltm.2021.2.04.