海量图书期刊资源，随时随地畅享阅读乐趣
Heterogeneity Stabilizes Reciprocal Altruism InteractionsMICHAEL A. FISHMAN; ARNON LOTEM; LEWI STONE · 2001
From Reciprocity to Unconditional Altruism through Signalling BenefitsArnon Lotem, Michael A. Fishman and Lewi Stone · Proceedings: Biological Sciences · 2003