Veiga, Pericles. “Comparative Study of the Clay Minerals of Mesozoic and Cenozoic Rocks from the Central Depression of the Rio Grande Do Sul State, Brazil”. Ciência e Natura 1, no. 1 (December 10, 1979): 67–78. Accessed April 25, 2025. https://periodicos.ufsm.br/cienciaenatura/article/view/24846.