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              Frenken K, van Oort F, Verburg T (2007) Related variety, unrelated variety and regional economic growth. Regional studies 41: 685-697. CrossRef.
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              Frenken, K., Van Oort, F., & Verburg, T. (2007). Related Variety, Unrelated Variety and Regional Economic Growth. Regional Studies, 41 (5): 685-697.
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              Frenken, K., Van Oort, F., Verburg, T. 2007, Related variety, unrelated variety and regional economic growth, Regional studies, vol. 41, № 5, p. 685-697, https://doi. org/10.1080/00343400601120296
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              Frenken, K., Oort, F., Verburg, T. (2007). Related variety, unrelated variety and regional economic growth. CrossRef. Regional studies, 41(5), pp. 685-697.
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