1. Aiginger, K., & Rossi-Hansberg, E. (2006). Specialization and concentration: A note on theory and evidence. Empirica,
33(4), 255–266.
2. Alecke, B., & Untiedt, G. (2006). Die geografische Konzentration von Industrie und Dienstleistungen in Deutschland. Neue empirische Evidenz mittels des Ellison-Glaeser-Index. GEFRA Working Paper 2.
3. Brülhart, M. (2001). Evolving geographical concentration of european manufacturing industries. Weltwirtschaftliches Archiv,
137(2), 215–243.
4. Ceapraz, I. L. (2008). The concepts of specialisation and spatial concentration and the process of economic integration: Theoretical relevance and statistical measures. the case of Romania’s regions. Romanian. Journal of Regional Science,
2(1), 68–93.
5. Devereux, M. P., Griffith, R.,& Simpson, H. (1999). The geographic distribution of production activity in the UK. Econometric Society World Congress 2000 Contributed Papers 1397.