WASET
    M. Rodionov and  Z. Dedovets,  Practical Problems as Tools for the Development of Secondary School Students’ Motivation to Learn Mathematics.   journal   = {International Journal of Educational and Pedagogical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    August 2017, vol. 130(10). 2430 - 2435
    [viewed 20 April 2024]. Available from: https://publications.waset.org/pdf/10008026.