TY  - RPRT
TI  - Evolution of cooperation without reciprocity.
AU  - R L Riolo
AU  - M D Cohen
AU  - R Axelrod
PY  - 2001
DO  - 10.1038/35106555
UR  - https://pubmed.ncbi.nlm.nih.gov/11719803/
ID  - 11719803
ER  -