Dąbrowski, Wojciech. 2008. “Investigating Non-Governmental Organisations Cooperating Across the European Union External Border. Examples from Polish-Russian (Kaliningrad Oblast) And Polish-Ukrainian Border Regions”. Bulletin of Geography. Socio-Economic Series, no. 10 (December):5–20. https://doi.org/10.1515/v10089-008-0009-3.