@article{martins_pinheiro_pinheiro_gründling_hey_2003,  title={A family of improved ZVT PWM converters using an auxiliary resonant source},  volume={14},  ISSN={0103-1759},  url={https://doi.org/10.1590/S0103-17592003000400009},  DOI={10.1590/S0103-17592003000400009},  number={4},  journal={Sba: Controle & Automação Sociedade Brasileira de Automatica},  publisher={Sociedade Brasileira de Automática},  author={Martins, M. L. and Pinheiro, H. and Pinheiro, J. R. and Gründling, H. A. and Hey, H. L.},  year={2003},  month={Nov},  pages={412–421} }