1. Faculty of Social Sciences, Calisia University-Kalisz, Kalisz, Poland
2. Faculty of Management, Open University, Heerlen, The Netherlands
3. Centre for European Studies, Alexandru Ioan Cuza University, Iași, România
4. Faculty of Socio-Economic Geography and Spatial Management, Adam Mickiewicz University, Poznań, Poland
5. Faculty of Mathematics and Computer Science, Adam Mickiewicz University, Poznań, Poland