Morgan, K. V., T. A. Hurly, M. Bateson, L. Asher, and S. D. Healy. 2012. Context-dependent decisions among options varying in a single dimension. Behavioural Processes 89:115-120.
S. D. Healy, and T. A. Hurly. 2002. Irrational choices in hummingbird foraging behaviour. Animal Behaviour 63: 587-596.
