@article{amorim_weingaertner_2007,  title={The behavior of graphite and copper electrodes on the finish die-sinking electrical discharge machining (EDM) of AISI P20 tool steel},  volume={29},  ISSN={1678-5878},  url={https://doi.org/10.1590/S1678-58782007000400004},  DOI={10.1590/S1678-58782007000400004},  number={4},  journal={Journal of the Brazilian Society of Mechanical Sciences and Engineering},  publisher={Associação Brasileira de Engenharia e Ciências Mecânicas - ABCM},  author={Amorim, Fred L. and Weingaertner, Walter L.},  year={2007},  month={Oct},  pages={366–371} }