Williamson, P.A., N.B. da Silva, P. Valle, and J.V. Robey. “The Moana-Tinguins Mililitite Province, Piaui State, Northeastern Brazil”. International Kimberlite Conference: Extended Abstracts 5 (February 1, 1991): 460–462. Accessed April 24, 2024. https://ikcabstracts.com/index.php/ikc/article/view/2605.