Stloukalová, B., T. Roztočil, D. Fialová, and Z. Chlup. “A Field Research: Evaluation of Efficiency of P.E. Lessons”. Journal of Human Sport and Exercise, vol. 10, no. 1proc, Sept. 2021, pp. S526-S536, doi:10.14198/jhse.2015.10.Proc1.48.