@article{oliveira_lima_2020,  title={Correlations of rock mass classifications applied to ferruginous caves},  volume={73},  ISSN={2448-167X},  url={https://doi.org/10.1590/0370-44672019730017},  DOI={10.1590/0370-44672019730017},  number={2},  journal={REM - International Engineering Journal},  publisher={Fundação Gorceix},  author={Oliveira, Paula Leal and Lima, Hernani Mota de},  year={2020},  month={Apr},  pages={267–272} }