HUSSEIN, Husham Idan. On -Line UPS with Low Frequency Transformer for Isolation. Iraqi Journal for Electrical and Electronic Engineering, [S. l.], v. 10, n. 2, p. 100–106, 2014. DOI: 10.37917/ijeee.10.2.5. Disponível em: https://ijeee.edu.iq/ijeee/article/view/179. Acesso em: 8 dec. 2025.