Tatiana V. Mayasova, Oksana V. Kolesova, N. N. D. E. G. G. E. V. K. (2019) «Implementation of competency approach in teaching mathematics to primary school children», Opción, 340, pp. 798-818. Disponible en: https://produccioncientificaluz.org/index.php/opcion/article/view/30199 (Accedido: 5mayo2024).