@inproceedings{inproceedingsa5fe9300,
title   = {Cycles in Piaui formation, Parnaíba basin, and Itararé subgroup, Paraná basin, Brazil},
author = {Rocha-Campos, A. C. and Lima Filho, Francisco Pinheiro and Canuto, José Roberto},
year = {1999},
publisher = {University of Calgary},
booktitle   = {International Congress on the Carboniferous Permian}
}