参考文献：
[1] 李郇, 徐现祥. 中国撤县(市)设区对城市经济增长的影响分析[J]. 地理学报, 2015, 70(8): 1202-1214.
[2] 邓慧慧, 潘雪婷. “大国大城”如何带动产业升级: 来自撤县设区的经验证据[J]. 世界经济文汇, 2020(6): 88-103.
[3] Hidalgo, C. A., Hausmann, R. The building blocks of economic complexity [J]. Proceedings of the National Academy of Sciences, 2009, 106(26): 10570-10575.
[4] Balland, P. A, Boschma, R., Crespo, J., et al. Smart specialization policy in the European Union: relatedness, knowledge complexity and regional diversification [J]. Regional Studies, 2019, 53(9): 1252-1268.
[5] He, C., Yan, Y., Rigby, D. Regional industrial evolution in China [J]. Papers in Regional Science, 2018, 97(2): 173-198.