@article{articleaa499982,
title   = {Vertical distributions of uranium, thorium and potassium and of volumetric heat production rates in the sediments of the São Francisco Basin, Central Brazil},
author = {Ribeiro, Fernando Brenha and Roque, Arnaldo},
year = {2001},
doi = {10.1016/s0969-8043(01)00070-7},
journal   = {Applied Radiation and Isotopes}
}