@article{article1f30acd6,
title   = {Potassium-argon ages of alkaline rocks from southern Brazil},
author = {Amaral, Gilberto and Bushee, Jonathan and Cordani, Umberto G. and Kawashita, Koji and Reynolds, J. H.},
year = {1967},
doi = {10.1016/s0016-7037(67)80041-3},
journal   = {Geochimica et Cosmochimica Acta}
}