Nature, Vol. 453, No. 7197., pp. 917-920.
J Exp Psychol Gen, Vol. 132, No. 1. (March 2003), pp. 23-46.
Journal of Risk and Uncertainty, Vol. 34, No. 3. (June 2007), pp. 259-286.
Curr Biol, Vol. 17, No. 1. (9 January 2007), pp. 49-53.
J Exp Biol, Vol. 210, No. Pt 2. (15 January 2007), pp. 269-277.
Neural Networks, Vol. 19, No. 8. (October 2006), pp. 1277-1301.
Ciba Found Symp, Vol. 208 (1997)
Anim Behav, Vol. 53, No. 6. (June 1997), pp. 1129-1142.
Proc Natl Acad Sci U S A, Vol. 99, No. 5. (5 March 2002), pp. 3352-3355.
Ecology, Vol. 61, No. 1. (1980), pp. 119-128.
Ecology, Vol. 68, No. 4. (1987), pp. 1104-1108.
Econometrica, Vol. 47, No. 2. (1979), pp. 263-292.
Psychol Rev, Vol. 111, No. 2. (April 2004), pp. 430-445.