1. Natural selection, kin selection and group selection;Grafen,1984
2. Group selection, altruism, and structured-deme models;Nunney;Am. Nat.,1985
3. Innate social aptitudes in man, an approach from evolutionary genetics;Hamilton,1975
4. Foundations of Social Evolution;Frank,1998
5. Unto Others: The Evolution and Psychology of Unselfish Behavior;Sober,1998