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Mayer, Heike; Cowell, Margaret (2014). Capital cities as knowledge hubs: the economic geography of homeland security contracting. In: Conventz, Sven; Derudder, Ben; Thierstein, Alain; Witlox, Frank (eds.) Hub cities in the knowledge economy. Seaports, airports, brainports. Transport and mobility series (pp. 223-246). Aldershot: Ashgate
