% pubman genre = article @article{item_3270919, title = {{Group-level cooperation in chimpanzees is shaped by strong social ties}}, author = {Samuni, Liran and Crockford, C. ǂ and Wittig, Roman M.}, language = {eng}, doi = {10.1038/s41467-020-20709-9}, publisher = {Nature}, year = {2021}, journal = {{Nature Communications}}, volume = {12}, eid = {539}, }