@article{pereira_afonso_vasconcelos_nabeta_2010,  title={An efficient two-level preconditioner based on lifting for FEM-BEM equations},  volume={9},  ISSN={2179-1074},  url={https://doi.org/10.1590/S2179-10742010000200002},  DOI={10.1590/S2179-10742010000200002},  number={2},  journal={Journal of Microwaves, Optoelectronics and Electromagnetic Applications},  publisher={Sociedade Brasileira de Microondas e Optoeletrônica e Sociedade Brasileira de Eletromagnetismo},  author={Pereira, Fabio Henrique and Afonso, Marcio Matias and Vasconcelos, João Antônio de and Nabeta, Silvio Ikuyo},  year={2010},  month={Dec},  pages={78–88} }