Ballesteros-Camaro, C. A., and J. Ríos-Guerrero. “Mineral Chemistry of Biotites in Gneisses from the Rio Urubú Metamorphic Suite Outcropping in the Serra Repartimento, Central Guyana Domain in the Amazonian Craton, Brazil: Petrogenetic Implications”. Boletín De Geología, vol. 41, no. 1, Jan. 2019, pp. 97-116, doi:10.18273/revbol.v41n1-2019005.