Brand, L. & Urbina, M. & Chadwick, A. & Devries, T.J. & Esperante, R. (2011)
A high resolution stratigraphic framework for the remarkable fossil cetacean assemblage of the Miocene/Pliocene Pisco Formation, Peru Journal of South American Earth Sciences, 31(4), 414–425
DOI: 10.1016/j.jsames.2011.02.015