1. Beresford, A., & Pettit, S. (2009). A geographical perspective on port performance in the United Kingdom. In T. Notteboom, C. Ducruet, & P. de Langen (Eds.), Ports in proximity: Competition and coordination among adjacent seaports, transport and mobility series (pp. 209–224). Farnham: Ashgate.
2. Blondel, V. D., Guillaume, J. L., Lambiotte, R., & Lefebvre, E. (2008). Fast unfolding of communities in large networks. Journal of Statistical Mechanics: Theory and Experiment, 10, P10008.
3. Blondel V. D., Krings G. M., & Thomas I. (2012). Regions and borders of mobile telephony in Belgium and around Brussels. Brussels Studies No. 42.
4. Brooks, M. R., Cullinane, K. P., & Pallis, A. A. (2017). Revisiting port governance and port reform: A multi-country examination. Research in Transportation Business & Management, 100(22), 1–10.
5. Charlier, J. J. (1988). Structural change in the Belgian port system, 1980–1986. Maritime Policy & Management, 15(4), 315–326.