@book{605809, author = {Rabenold, Diana and Pearson, Osbjorn M.}, title = {Abrasive, Silica Phytoliths and the Evolution of Thick Molar Enamel in Primates, with Implications for the Diet of Paranthropus boisei}, year = {2011}, url = {http://dx.doi.org/10.1371%2Fjournal.pone.0028379} }