@article{boutrid_mamen_djouama_chettibi_2019,  title={Depth effect on sandstone strength properties},  volume={72},  ISSN={2448-167X},  url={https://doi.org/10.1590/0370-44672018720107},  DOI={10.1590/0370-44672018720107},  number={2},  journal={REM - International Engineering Journal},  publisher={Fundação Gorceix},  author={Boutrid, Abdelaziz and Mamen, Belgacem and Djouama, Mohamed Cherif and Chettibi, Momhamed},  year={2019},  month={Apr},  pages={353–361} }