@inproceedings{inproceedingsfdd663a4,
title   = {Ash-fall-derived vitroclastic tuffaceous sediments in the permian of the Paraná Basin and their provenance},
author = {Coutinho, José Moacyr Vianna and Hachiro, Jorge and Coimbra, Armando Márcio and Santos, Paulo Roberto dos},
year = {1991},
publisher = {Instituto de Geociências},
booktitle   = {International Gondwana Symposium}
}