GRZEBIELUCHA, Jacek. Optional fees and the right to free public education. Progress, [S. l.], n. 11, p. 101–110, 2022. DOI: 10.26881/prog.2022.11.08. Disponível em: https://czasopisma.bg.ug.edu.pl/index.php/Progress/article/view/7534. Acesso em: 22 jul. 2024.