IvaniushinaV., KhodorenkoD., and AlexandrovD. “Age and Gender Differences and the Contribution of School Size and Type in the Prevalence of Bullying”. Voprosy Obrazovaniya / Educational Studies Moscow, no. 4, Dec. 2021, pp. 220-42, doi:10.17323/1814-9545-2021-4-220-242.