@article{costa_almeida_gomes_2013,  title={Pyro-expanded black slate in sculptural art},  volume={59},  ISSN={0366-6913},  url={https://doi.org/10.1590/S0366-69132013000100015},  DOI={10.1590/S0366-69132013000100015},  number={349},  journal={Cerâmica},  publisher={Associação Brasileira de Cerâmica},  author={Costa, J. C. e and Almeida, T. and Gomes, C. S. F.},  year={2013},  month={Jan},  pages={134–140} }