Chiumbo Paiva, José, Eric Crespo Hurtado, Raúl López Fernández, y Tomás Crespo Borges. Mathematics Contests in Huambo Province: A Pedagogical Model for Their Development. Revista Conrado 16, no. S 1 (noviembre 24, 2020): 249-255. Accedido marzo 8, 2021. https://conrado.ucf.edu.cu/index.php/conrado/article/view/1548.