Nocoń, Jarosław, et al. “Pesco As the Modern Defense Initiative of the European Union: Positions of Western European Countries Vs Positions of Eastern European Countries ”. European Journal of Transformation Studies, vol. 7, no. 2, Sept. 2019, pp. 128-41, https://czasopisma.bg.ug.edu.pl/index.php/journal-transformation/article/view/5013.