PAIANOK, O. A. Output d.c. voltage harmonics research in d.c. contact system of city traction substations. Visnyk of Vinnytsia Politechnical Institute, [S. l.], n. 1, p. 84–88, 2010. Disponível em: https://visnyk.vntu.edu.ua/index.php/visnyk/article/view/564. Acesso em: 16 jul. 2024.