1. Anderson, Kym and Hege Norheim, "From Imperial to Regional Trade Preferences: Its Effect on Europe's Intra- and Extra-Regional Trade," Review of World Economics , 129 , 1:78-101, 1993.
2. Applica and wiiw (The Vienna Institute for International Economic Studies), "Changing Regions—Structural Changes in the EU Regions," Report for the EU, European Commission's Director Generalfor Regional Policy, 2007 http://ec.europa.eu/regional_policy/sources/docgener/studies/pdf/changing_regions2007.pdf
3. Bowen, Harry P., Harris Munandar, and Jean-Marie Viaene, "Are EU Countries Less Integrated than U.S. States? Theory and Evidence," Journal of Regional Science , 51 , 4:653-677, 2011.
4. Bureau of Labor Statistics (BLS), "CPI Inflation Calculator" http://www.bls.gov/data/inflation_calculator.htm
5. Chou, K. H., C. H. Chen, C. C. Mai, "Geospatial Analysis of China's Exports, 1991-2008," Eurasian Geography and Economics , 50 , 5:532-546, 2009.