@article{ricardi-branco_arai_rösler_2002,  title={Megaspores from coals of the Triunfo Member, Rio Bonito Formation (Lower Permian), northeastern Paraná State, Brazil},  volume={74},  ISSN={0001-3765},  url={https://doi.org/10.1590/S0001-37652002000300011},  DOI={10.1590/S0001-37652002000300011},  number={3},  journal={Anais da Academia Brasileira de Ciências},  publisher={Academia Brasileira de Ciências},  author={RICARDI-BRANCO, FRESIA and ARAI, MITSURU and RÖSLER, OSCAR},  year={2002},  month={Sep},  pages={491–503} }