Dependence of Adaptability on Environmental Structure in a Simple Evolutionary Model. - Jeffrey A. Fletcher; Mark A. Bedau; Martin Zwick (Adapt. Behav., 1996)

Altruism, the prisoner's dilemma, and the components of selection. - Jeffrey A. Fletcher; Martin Zwick (SMC, 2001)

Hamilton's rule applied to reciprocal altruism. - Jeffrey A. Fletcher; Martin Zwick (IEEE Congress on Evolutionary Computation, 2004)