@article{martins_paula_botelho_2021,  title={Technological Innovations and Industry 4.0 in the Steel Industry: Diffusion, Market Structure and Intra-Sectoral Heterogeneity},  volume={20},  ISSN={2178-2822},  url={https://doi.org/10.20396/rbi.v20i00.8660896},  DOI={10.20396/rbi.v20i00.8660896},  journal={Revista Brasileira de Inovação},  publisher={Universidade Estadual de Campinas},  author={Martins, Mozart Santos and Paula, Germano Mendes de and Botelho, Marisa dos Reis A.},  year={2021},  pages={e021006} }