KosaretskyS., KupriyanovB., & Filippova D. (2016). Specific Features of Children Involvement in Supplementary Education Depending on Cultural, Educational and Financial Status of Families and Place of Living. Voprosy Obrazovaniya / Educational Studies Moscow, (1), 168-190. https://doi.org/10.17323/1814-9545-2016-1-168-190