@article{articledaf58316,
title   = {Radiometric age determinations from northern Brazil},
author = {Almeida, Fernando Flávio Marques de and Melcher, Geraldo Conrado and Cordani, Umberto G. and Kawashita, Koji and Vandoros, Paul},
year = {1968},
journal   = {Boletim da Sociedade Brasileira de Geologia}
}