@article{articlea198006f,
title   = {Conifers (Paranochadus and Buriadia) from early permian coal seams of southern Brazil},
author = {Ricardi-Branco, Frésia and Torres de Ricardi, Margarita and Rösler, Oscar},
year = {1997},
journal   = {Anais da Academia Brasileira de Ciências}
}