Rudnicki, Roman. “Demographic Determinants of the Activity of Farms in Poland in the Acquisition of European Union Funds in the Years 2004-2006”. Bulletin of Geography. Socio-economic Series, no. 12 (December 1, 2009): 45–59. Accessed January 31, 2023. https://apcz.umk.pl/BGSS/article/view/v10089-009-0003-4.