Ustych, S., Rovt, A. and Piasetska-Ustych, S. (2016) “A system approach to quantify development of modern transborder processes”, TRANSBORDER ECONOMICS. International Journal on Transborder Economics, Finance, Politics and Statistics, 1(2), pp. 117–126. Available at: https://journals.ur.edu.pl/te/article/view/8611 (Accessed: 5 December 2025).