M. Rodionov and Z. Dedovets, Motivational Orientation of the Methodical System of Teaching Mathematics in Secondary Schools. journal = {International Journal of Educational and Pedagogical Sciences}, [online]. World Academy of Science, Engineering and Technology. April 2019, vol. 149(5). 614 - 621 [viewed 07 March 2021]. Available from: https://publications.waset.org/pdf/10010360.