BAUM, J.K. & MYERS, R.A. (2004)
Shifting baselines and the decline of pelagic sharks in the Gulf of Mexico. Ecology Letters, 7 (2): 135–145
DOI: 10.1111/j.1461-0248.2003.00564.x

PEREZ, V.J. & PIMIENTO, C. & HENDY, A. & GONZÁLEZ-BARBA, G. & HUBBELL, G. & MACFADDEN, B.J. (2017)
Late Miocene chondrichthyans from Lago Bayano, Panama: Functional diversity, environment and biogeography. Journal of Paleontology, 91 (3): 512-547
DOI: 10.1017/jpa.2017.5