[1]
M. H. O. Henklain and J. dos S. Carmo, “Stimulus Equivalence and Increase of Correct Responses in Addition and Subtraction Problems”, Paidéia (Ribeirão Preto), vol. 23, no. 56, pp. 349–358, Sep. 2013, doi: 10.1590/1982-43272356201309.