1. University of Silesia , Faculty of Earth Science, Department of Economic Geography, 60 Będzińska st., 41-200 Sosnowiec, Poland
2. University of Gothenburg , School of Business, Economics and Law, Department of Economy and Society – Unit for Human Geography, Viktoriagatan 13, 411 25 Gothenburg, Sweden
3. Nicolaus Copernicus University in Toruń, Faculty of Earth Sciences, Department of Urban Studies and Regional Development, Lwowska 1, 87-100 Toruń, Poland