http://www.ljmu.ac.uk/EIUA/second-tier-cities/index.htm http://www.ljmu.ac.uk/EIUA/EIUA_Docs/Second_Tier_Cities.pdf

http://www.ljmu.ac.uk/EIUA/EIUA_Docs/Second_Tier_Cities.pdf

lewis Dijkstra
Lewis Dijkstra is the Deputy Head of the Economic
Analysis Unit in the Directorate-General for Regional and
Urban Policy of the European Commission
https://www.amgasparin.wordpress.com