Choice, contingency discrimination, and foraging theory.

@article{Baum1999ChoiceCD,
  title={Choice, contingency discrimination, and foraging theory.},
  author={William M. Baum and J. J. Schwendiman and Kerry Bell},
  journal={Journal of the experimental analysis of behavior},
  year={1999},
  volume={71 3},
  pages={355-73}
}