Ustich, Sergey. “System of Essence Transboundary Processes: Qualitative and Quantitative Evaluation”. Visnyk of V. N. Karazin Kharkiv National University. Series "Sociological studies of contemporary society: methodology, theory, methods"0, no. 1101 (August 6, 2019): 132-137. Accessed May 3, 2024. https://periodicals.karazin.ua/ssms/article/view/13637.