TA02443867 209. Langer P, MA Nowak, C Hauert (2008). Spatial invasion of cooperation. J theor Biol 250: 634-641. 210. Michel 1B, P1 Yeh, R Chait, RC Moellering, R Kishony (2008). Drug interactions modulate the potential for evolution of resistance. P Nad Acad Sci USA 105: 14918-14923. 211. Nowak MA (2008).