Kwiatek J, Kwiatek A. On the frontier questions denoting Silesia and Lesser Poland in the interwar period. Bord. Reg. Stud. [Internet]. 2017 Oct. 25 [cited 2024 Nov. 2];5(2):73-104. Available from: https://czasopisma.uni.opole.pl/index.php/p/article/view/386