Garda, Gianna, et al. “Sulfur Stable Isotope Signatures of the Morro Da Pedra Preta Formation, Serra Do Itaberaba Group, São Paulo State, Brazil”. Geochimica Brasiliensis, vol. 16, no. 1, May 2017, p. 79, https://geobrasiliensis.org.br/geobrasiliensis/article/view/500.