Gabdullin R, Kozhabaev K, Kostangeldinova A. Organization of educational and developmental training of school students at mathematics lessons. Opción [Internet]. 1 de abril de 2018 [citado 5 de mayo de 2024];34(85):605-31. Disponible en: https://www.produccioncientificaluz.org/index.php/opcion/article/view/23741