E. S. de . Alencar, P. dos S. de . Jesus, and D. . . Díaz-Levicoy, “The curricular documents that guide the teaching of mathematics in the first year of elementary school in Brazil and in Chile: a preliminary analysis”, ER, vol. 27, no. 3, pp. 838–856, May 2020, doi: 10.14393/ER-v27n3a2020-3.