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Spatio-temporal evolution and mechanism of regional innovation efficiency: Evidence from Yangtze River Delta Urban Agglomeration of China
- Xianzhong Cao,
- Bo Chen,
- Yuefang Si,
- Senlin Hu,
- Gang Zeng
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- Published: July 1, 2021
- https://doi.org/10.1371/journal.pone.0253598