@article{articleb8f75f0b,
title   = {Absolute dating of permian Ash-Fall in the Rio de Bonito formation, Paraná Basin, Brazil},
author = {Matos, Sérgio Luís Fabris de and Yamamoto, Jorge Kazuo and Riccomini, Claudio and Hachiro, Jorge and Tassinari, Colombo Celso Gaeta},
year = {2001},
doi = {10.1016/S1342-937X(05)70341-5},
journal   = {Gondwana research}
}