Germany: Policing metropolises in a system of cooperative federalism
Berlin as the German Capital and a city state compared to Cologne as the biggest city in North Rhine-Westphalia

Frevel, Bernhard Aden, Hartmut (2017) Germany: Policing metropolises in a system of cooperative federalism , Devroe/Edwards/Ponsaers (ed.) Policing European Metropolises. The politics of security in city-regions.