Szymańska, Daniela, Stefania Środa-Murawska, Karolina Świderska, and Czesław Adamiak. “Internal Migration in Germany in 1990 And 2005”. Bulletin of Geography. Socio-economic Series, no. 12 (December 1, 2009): 109–120. Accessed April 25, 2024. https://apcz.umk.pl/BGSS/article/view/v10089-009-0007-0.