% pubman genre = article @article{item_1554761, title = {{4,300-Year-old chimpanzee sites and the origins of percussive stone technology}}, author = {Mercader, Julio and Barton, Huw and Gillespie, Jason and Harris, Jack and Kuhn, Steven and Tyler, Robert and Boesch, Christophe}, language = {eng}, doi = {10.1073/pnas.0607909104}, year = {2007}, date = {2007}, journal = {{Proceedings of the National Academy of Sciences of the United States of America}}, volume = {104}, number = {9}, pages = {3043--3048}, }