During the 13th five-year plan period (2016–2017), the coordination of the three subsystems slows down, but it still shows an increasing trend. 3.2 Spatial distribution of coupling and coordination degrees We calculate the coupling degree during the period from 2003–2017 and classify the coupling degree of each year according to the quartile method.
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Coupling coordination between environment, economy and tourism: A case study of China.
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