Hanssens, H., B. Derudder, and F. Witlox. “Managing Organizational and Geographical Complexity: The ‘positionality’ of Advanced Producer Services in the Globalizing Economies of Metropolitan Regions”. ERDKUNDE, vol. 66, no. 1, Mar. 2012, pp. 45-55, doi:10.3112/erdkunde.2012.01.04.