@inproceedings{inproceedings60ce0d64,
title   = {Distribution, mineralogy, petrography, provenance and significance of permian ash-bearing deposits in the Paraná basin},
author = {Coutinho, José Moacyr Vianna and Hachiro, Jorge},
year = {2002},
publisher = {SBG-NO},
booktitle   = {Congresso Brasileiro de Geologia}
}