KNOLL, Vladislav. Types of non-dominant languages in Europe. Zeszyty Łużyckie, [S. l.], v. 57, n. 1, p. 23–51, 2022. DOI: 10.32798/zl.911. Disponível em: https://www.journals.polon.uw.edu.pl/index.php/zl/article/view/911. Acesso em: 16 sep. 2026.