Dijkstra, Lewis Dijkstra. Metropolitan regions in the EU (pdf) // Regional Focus. A series of short papers on regional research and indicators produced by the Directorate-General for Regional Policy. EC Directorate-General for Regional and Urban Policy, 2009. Metropolitan regions, metros for short, are NUTS-3 regions or groupings of NUTS-3 regions representing all urban agglomerations of more than 250 000 inhabitants. (на английски)
