R. Johansson, Small state boundary conflict. Belgium and the Belgian-German border 1914-1919. BMGN - Low Countries Historical Review, [S. l.], v. 105, n. 4, p. 654–655, 1990. DOI: 10.18352/bmgn-lchr.3317. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-103775.. Acesso em: 30 jun. 2024.