RIBES, E.; ONTIVEROS, S.; TORRES, C.; CALDERÓN, G.; CARVAJAL, J.; MARTÍNEZ, C.; VARGAS, I. The equalization of the sample selection of second-order stimuli: Effects of two procedures. Mexican Journal of Behavior Analysis, [S. l.], v. 31, n. 1, p. 1–22, 2011. DOI: 10.5514/rmac.v31.i1.23220. Disponível em: https://journals.unam.mx/index.php/rmac/article/view/23220. Acesso em: 3 jul. 2024.