Authors: Thure E Cerling; Fredrick Kyalo Manthi; Emma N Mbua; Louise N Leakey; Meave G Leakey; Richard E Leakey; Francis H Brown; Frederick E Grine; John A Hart; Prince Kaleme; Hélène Roche; Kevin T Uno; Bernard A Wood Journal: Proc Natl Acad Sci U S A Date: 2013-06-03 Impact factor: 11.205