FRENKEN K., VAN OORT F. and VERBURG T. (2007) Related Variety, Unrelated Variety and Regional Economic Growth, Regional Studies 41 (5): 685-697.
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K., F. R. E., F., V. A. N., T, V. E. R. (2007). Related Variety, Unrelated Variety and Regional Economic Growth. Regional Studies, 41(5), pp. 685-697.
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