Zalewa, Piotr, Mariusz Sagan, Bartosz Jóźwik, and Oleg Gorbaniuk. “The Evaluation of Instruments Responsible for Improvement of Regional Attractiveness for Investors in Chełm-Zamość Subregion”. Regional Barometer. Analyses & Prognoses, no. 4 (22) (February 2, 2011): 55–70. Accessed December 5, 2025. https://czaz.akademiazamojska.edu.pl/index.php/br/article/view/1358.