TODOROV, J. C.; CARNEIRO MONTEIRO, W. Concurrent second-order schedules of reinforcement: Relative response requirement. Mexican Journal of Behavior Analysis, [S. l.], v. 7, n. 2, p. 141–147, 2011. DOI: 10.5514/rmac.v7.i2.25735. Disponível em: https://revistas.unam.mx/index.php/rmac/article/view/25735. Acesso em: 3 may. 2024.