LECH, Aleksandra. Implementation of TPA (Third Party Access) principle in Polish energy sector. Comparative Economic Research. Central and Eastern Europe, [S. l.], v. 13, n. 3, p. 33–45, 2010. DOI: 10.2478/v10103-009-0037-0. Disponível em: https://www.czasopisma.uni.lodz.pl/CER/article/view/6577. Acesso em: 10 dec. 2025.