Valeeva, Diliara, Sofia Dokuka, and Maria Yudkevich. 2017. “How Academic Failures Break Up Friendship Ties: Social Networks and Retakes”. Voprosy Obrazovaniya / Educational Studies Moscow, no. 1 (March), 8-24. https://doi.org/10.17323/1814-9545-2017-1-8-24.