Avila Santibáñez, R., González Montiel, J. C., Miranda Hernández, P. and Guzmán González, M. de L. (2010) “Stimuli effects on optimal behavior in a sunk-cost situation with pigeons”., Mexican Journal of Behavior Analysis, 36(1), pp. 19–31. doi: 10.5514/rmac.v36.i1.18012.