Śmigerska-Belczak , I. . (2019). 30 years of integration in the Baltic Sea Region: security against the background of the current geopolitical situation . Kwartalnik Kolegium Ekonomiczno-Społecznego. Studia I Prace, (2(38), 49–65. Pobrano z https://econjournals.sgh.waw.pl/kwes/article/view/2267