@article{nicolau_2015,  title={Impact of Electronic Voting Machines on Blank Votes and Null Votes in Brazilian Elections in 1998},  volume={9},  ISSN={1981-3821},  url={https://doi.org/10.1590/1981-38212015000300017},  DOI={10.1590/1981-38212015000300017},  number={3},  journal={Brazilian Political Science Review},  publisher={Associação Brasileira de Ciência Política},  author={Nicolau, Jairo},  year={2015},  month={Sep},  pages={3–20} }