地级市间方言距离计算公式:
参考文献: Liu, Yuyun, Yang Jiao, and Xianxiang Xu. "Promoting or preventing labor migration? Revisiting the role of language." China Economic Review (2020): 101407.
[size=7.763pt]刘毓芸,徐现祥,肖泽凯.劳动力跨方言流动的倒U型模式[J].经济研究,2015,50(10):134-146+162.
[size=7.763pt]吴小康,于津平.方言距离与城市间产业结构趋同[J].世界经济,2021,44(02):126-150.
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