@ARTICLE{Polko_Adam_Introduction_2012, author={Polko, Adam and Heffner, Krystian}, number={vol. 34}, journal={Studia Regionalia}, howpublished={online}, year={2012}, publisher={Polish Academy of Sciences – Committee for Spatial Economy and Regional Planning and European Regional Science Association (ERSA) Polish Section}, title={Introduction}, URL={http://www.journals.pan.pl/Content/98117/mainfile.pdf}, }