Kotsan, N., G. Kopachinska, Y. Vozniuk, and R. Kotsan. “Basic Models of Protection and Functioning of the Ukrainian Border in Modern Geopolitical Realities: A View from Ukraine”. European Spatial Research and Policy, vol. 29, no. 1, June 2022, pp. 79-95, doi:10.18778/1231-1952.29.1.04.