Avdeenko, Galina, Sergey Dmitrev, and Jacek Zieliński. “COVID-19 and Entrepreneurial Activity: A Comparative Analysis of Consequences and Expectations”. De Securitate et Defensione. O Bezpieczeństwie i Obronności 6, no. 2 (December 28, 2020): 8–22. Accessed December 3, 2022. https://czasopisma.uph.edu.pl/desecuritate/article/view/1875.