Levchenkov, Andrey V., and Ivan S. Gumenyuk. “The Spatial Development of the Rural Settlement of East Prussia: Kaliningrad Region”. International Journal of Economics and Financial Issues 5, no. 2S (November 21, 2015): 30–36. Accessed March 28, 2024. https://econjournals.com/index.php/ijefi/article/view/1603.