@article{articlee12eaacf,
title   = {Radioactivity distribution in some permian sediments from the Iratí and Corumbataí formations of the Paraná basin, southeastern Brazil},
author = {Carlos, Dionísio Uendro and Brenha Ribeiro, Fernando and Saad, Antonio Roberto and Nicolai, Silvia Helena de Araújo},
year = {2004},
journal   = {Applied Radiation and Isotopes}
}