Gwiaździńska-Goraj, M., and A. Jezierska-Thöle. “Development Models for the Service-Sector in Small Cities Along the Polish Border With Germany and Russia”. Acta Universitatis Lodziensis. Folia Geographica Socio-Oeconomica, no. 15, Jan. 2013, pp. 39-60, doi:10.18778/1508-1117.15.03.