@article{r._padilha-feltrin_ochoa_2007,  title={Distribution transformers modeling with angular displacement: actual values and per unit analysis},  volume={18},  ISSN={0103-1759},  url={https://doi.org/10.1590/S0103-17592007000400009},  DOI={10.1590/S0103-17592007000400009},  number={4},  journal={Sba: Controle & Automação Sociedade Brasileira de Automatica},  publisher={Sociedade Brasileira de Automática},  author={R., Dario E. Rodas and Padilha-Feltrin, Antonio and Ochoa, Luis F.},  year={2007},  month={Oct},  pages={490–500} }