[1]
O. E. González-Giraldo and M. T. Castellanos Sánchez, “The abacus closed as a pedagogical mediation in the construction of multiplication and division operations in the third degree of official educational institutions”, IyD, vol. 6, no. 2, pp. 98–108, Jun. 2019, doi: 10.26620/uniminuto.inclusion.6.2.2019.98-108.