Siga Jr., Oswaldo, et al. “ U-Pb (Zircon) Ages of Metavolcanic Rocks from the Itaiacoca Group: Tectonic Implications ”. Geologia USP. Série Científica, vol. 3, agosto de 2003, p. 39-49, https://doi.org/10.5327/S1519-874X2003000100004.