@article{article6ddf8418,
title   = {Chondrichthyans from the base of the Irati Formation (Early Permian, Parána Basin), São Paulo, Brazil},
author = {Chahud, Artur and Fairchild, Thomas R. and Petri, Setembrino},
year = {2010},
doi = {10.1016/j.gr.2010.01.006},
journal   = {Gondwana research}
}