% pubman genre = article @article{item_1552950, title = {{Long-term reciprocation of grooming in wild West African chimpanzees}}, author = {Gomes, Cristina M. and Mundry, Roger and Boesch, Christophe}, language = {eng}, doi = {10.1098/rspb.2008.1324}, year = {2009}, date = {2009}, journal = {{Proceedings of the Royal Society, Series B: Biological Sciences}}, volume = {276}, number = {1657}, pages = {699--706}, }