1. Laboratory for Networks, Technology & Innovation, Corvinus University of Budapest , Budapest, Hungary
2. Agglomeration and Social Networks Lendület Research Group, Centre for Economic and Regional Studies (KRTK) , Budapest, Hungary
3. Centre for Economic and Regional Studies (KRTK) , Budapest, Hungary
4. Department of Geography, Umeå University , Umeå, Sweden
5. Center for Regional Science, Umeå University , Umeå, Sweden