Silva Filho, O. L. da, Ferreira, M. e Nogueira, D. X. P. (2020) “The abacus in the inquire-based learning of addition and subtraction”, Plurais - Revista Multidisciplinar. Salvador, 5(2), p. 22–39. doi: 10.29378/plurais.2447-9373.2020.v5.n2.22-39.