Samoylenko, V. et al. 2021. PECULIARITIES OF VARIABLES REPLACEMENT IN THE RIEMAN INTEGRAL IN THE MATHEMATICAL ANALYSIS COURSE IN FUTURE TEACHERS OF MATHEMATICS TRAINING. Physical and Mathematical Education. 27, 1 (Apr. 2021), 82–88. DOI:https://doi.org/10.31110/2413-1571-2021-027-1-013.