 Evolutionary game theory owes its explicit genesis to  Maynard Smith (1982)  (**). For a text that integrates game theory directly with biology, see  Hofbauer and Sigmund (1998)  (**).  Sigmund (1993)  presents this material in a less technical and more accessible format. Some exciting applications of evolutionary game theory to a range of philosophical issues, on which this article has drawn heavily, is  Skyrms (1996)  (**). These issues and others are critically discussed from various angles in  Danielson (1998).  Mathematical foundations for evolutionary games are presented in  Weibull (1995),  and pursued further in  Samuelson (1997).  As noted above,  Gintis (2009b)  (**) now provides an introductory textbook that takes evolutionary modeling to be foundational to all of game theory.  H.P. Young (1998)  gives sophisticated models of the evolutionary dynamics of cultural norms through the game-theoretic interactions of agents with limited cognitive capacities but dispositions to imitate one another.  Fudenberg and Levine (1998)  gives the technical foundations for modeling of this kind.