Profitability, rate maximization and reward delay: A test of the simultaneous-encounter model of prey choice with Parus atricapillusv. 134No. 2University of Chicago Press254–272
Barkan, Christopher P. L. and Withiam, Matthew L. 1989. "Profitability, rate maximization and reward delay: A test of the simultaneous-encounter model of prey choice with Parus atricapillus." American Naturalist, 134, (2) 254–272.