M. Rodionov and Z. Dedovets, Academic Motivation Maintenance for Students While Solving Mathematical Problems in the Middle School. journal = {International Journal of Educational and Pedagogical Sciences}, [online]. World Academy of Science, Engineering and Technology. September 2015, vol. 106(10). 3420 - 3423 [viewed 20 April 2024]. Available from: https://publications.waset.org/pdf/10002557.