@article{article164f6807,
title   = {Characteristics of hammer stones and anvils used by wild bearded capuchin monkeys (Cebus libidinosus) to crack open palm nuts},
author = {Visalberghi, Elisabetta and Fragaszy, Dorothy and Ottoni, Eduardo Benedicto and Izar, Patricia and Oliveira, M. G. de and Andrade, Fábio Ramos Dias de},
year = {2007},
doi = {10.1002/ajpa.20546},
journal   = {American Journal of Physical Anthropology}
}