LÓPEZ, F.; ZUBIETA, O. L. Shock delivery during the pause in a fixed-interval schedule. Mexican Journal of Behavior Analysis, [S. l.], v. 18, n. 1y2, p. 17–28, 2011. DOI: 10.5514/rmac.v18.i1y2.23371. Disponível em: https://journals.unam.mx/index.php/rmac/article/view/23371. Acesso em: 27 jul. 2024.