TY  - RPRT
TI  - Group selection among alternative evolutionarily stable strategies.
AU  - R Boyd
AU  - P J Richerson
PY  - 1990
DO  - 10.1016/s0022-5193(05)80113-4
UR  - https://pubmed.ncbi.nlm.nih.gov/2232821/
ID  - 2232821
ER  -