@article{martins_russi_hey_2005,  title={A classification methodology for zero-voltage transition PWM converters},  volume={16},  ISSN={0103-1759},  url={https://doi.org/10.1590/S0103-17592005000100005},  DOI={10.1590/S0103-17592005000100005},  number={1},  journal={Sba: Controle & Automação Sociedade Brasileira de Automatica},  publisher={Sociedade Brasileira de Automática},  author={Martins, M. L. and Russi, J. L. and Hey, H. L.},  year={2005},  month={Jan},  pages={44–55} }