Mihaela POPESCU; Alexandru BITOLEANU. Energy Efficiency Improvement in DC Railway Systems: The State of the Art. Newest Updates in Physical Science Research Vol. 5, [S. l.], p. 66–106, 2021. DOI: 10.9734/bpi/nupsr/v5/8457D. Disponível em: https://stm.bookpi.org/NUPSR-V5/article/view/1399. Acesso em: 4 jun. 2026.