S. A. R. F. Costa, M. Richter, P. M. de Toledo, and H. M. Moraes-Santos, “Shark teeth from Pirabas Formation (Lower Miocene), northeastern Amazonia, Brazil”, bcnaturais, vol. 4, no. 3, pp. 221–230, Dec. 2009, doi: 10.46357/bcnaturais.v4i3.650.