GRIGOROV, Alexander. Exergy Efficiency of Bulgarian Lignite fired Steam Boiler P-62 at various Load and Fuel Quality. International Journal of Sciences: Basic and Applied Research (IJSBAR), Jordan, v. 30, n. 4, p. 138–146, 2016. Disponível em: https://www.gssrr.org/JournalOfBasicAndApplied/article/view/6556. Acesso em: 22 sep. 2025.