TODOROV, J. C.; FERREIRA, M. C. C. Multiple and concurrent schedules of fixed-interval reinforcement. Mexican Journal of Behavior Analysis, [S. l.], v. 4, n. 1, p. 101–109, 2011. DOI: 10.5514/rmac.v4.i1.23657. Disponível em: https://revistas.unam.mx/index.php/rmac/article/view/23657. Acesso em: 17 may. 2024.