Kourtit, K., Nijkamp, P. and Suzuki, S. 2017. Effective Clusters as Territorial Performance Engines in a Regional Development Strategy - A Triple-Layer DEA Assessment of the Aviation Valley in Poland. REGION. 4, 3 (Aug. 2017), 39–63. DOI:https://doi.org/10.18335/region.v4i3.166.