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. MJBA [Internet]. 2011 Jan. 24 [cited 2024 Jul. 3];31(1):1-22. Available from: https://journals.unam.mx/index.php/rmac/article/view/23220