OMMEREN, H.R. van. C.A.A. Linssen, Historische opstellen over Lotharingen en Maastricht in de middeleeuwen. BMGN - Low Countries Historical Review, [S. l.], v. 102, n. 2, p. 282–284, 1987. DOI: 10.18352/bmgn-lchr.2824. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-103171.. Acesso em: 27 sep. 2024.