Cheating monkeys undermine group strength in enemy territoryDOI: info:10.1073/pnas.1115937109v. 109No. 2National Academy of Sciences (U.S.)501–505
Crofoot, Margaret C. and Gilby, Ian C. 2011. "Cheating monkeys undermine group strength in enemy territory." Proceedings of the National Academy of Sciences of the United States of America, 109, (2) 501–505. https://doi.org/10.1073/pnas.1115937109.