@article{article7bb87352,
title   = {Outline of the precambrian geochronology of South America},
author = {Cordani, Umberto G. and Melcher, Geraldo Conrado and Almeida, Fernando Flávio Marques de},
year = {1968},
doi = {10.1139/e68-058},
journal   = {Canadian Journal of Earth Sciences}
}