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An empirical study on the economic linkage characteristics of Yangtze River port cities based on discrete second-order derivatives

Fang Xie

Fang Xie

Maanshan Technical College, Department of Economics& TradeChina
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Xie, Fang
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Bingliang Song

Bingliang Song

Shanghai Maritime University, School of Economics & ManagementShanghai, China
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Song, Bingliang
  
Jun 03, 2023
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Published Online: Jun 03, 2023
Received: Jun 23, 2022
Accepted: Oct 26, 2022
DOI: https://doi.org/10.2478/amns.2023.1.00213
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© 2023 Fang Xie et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.
Language:
English
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Journal Subjects:
Life Sciences, Life Sciences, other, Mathematics, Applied Mathematics, General Mathematics, Physics, Physics, other
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