.. Scheming. 2006. Fixation of strategies for an evolutionary game in finite populations. Bull, Math. Biol. 68, 1923-1944. Antal. T.. ()Musks It,. Wakeley. J.. Taylor. 1W.. Nowak. MA.. 2009. Evolution of cooperation by phenotypic similarity, Proc. Natl. Mad. Sci. USA. 106 (21), 8597 8600. Beekman. M.