Bakhyt, Sydykhov, Burkhan Kalimbetov, y Zhanibek Khabibullayev. 2019. «Possibilities of Mathematical Problems in Logical Thinking. Development of Secondary Education Pupils». Opción 34 (85-2), 441-57. https://www.produccioncientificaluz.org/index.php/opcion/article/view/23803.