Vlădescu, Cristina. “Mastery Learning and the Impact of the COVID-19 Pandemic on Teaching and Learning Mathematics in Romanian Schools”. Journal of Education in Black Sea Region 7, no. 2 (June 16, 2022): 2–23. Accessed April 24, 2024. https://jebs.ibsu.edu.ge/jms/index.php/jebs/article/view/258.