Bradley, J., Bradley, J. and Untiedt, G. (2007) “The macro-economic impacts of the European Union structural policy in the convergence regions: Methodical notes and empirical results for the period 2007–2013”, Raumforschung und Raumordnung | Spatial Research and Planning, 65(4), pp. 301–314. doi:10.1007/BF03183018.