@article{watanabe_aredes_akagi_2004,  title={The p-q theory for active filter control: some problems and solutions},  volume={15},  ISSN={0103-1759},  url={https://doi.org/10.1590/S0103-17592004000100010},  DOI={10.1590/S0103-17592004000100010},  number={1},  journal={Sba: Controle & Automação Sociedade Brasileira de Automatica},  publisher={Sociedade Brasileira de Automática},  author={Watanabe, Edson H. and Aredes, Maurício and Akagi, Hirofumi},  year={2004},  month={Jan},  pages={78–84} }