Evolution Characteristics of Advanced Nonferrous Metal Industry Patent Cooperation Network in China from the Perspective of Multilayer Network

<div>The tentative field of the advanced nonferrous metal industry technology (<a href="https://static-preview.hindawi.com/articles/mpe/volume-2022/1023816/figures/#EEq1">1</a>).</div>

Mathematical Problems in Engineering

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Figure 8

Figure 8: Evolution Characteristics of Advanced Nonferrous Metal Industry Patent Cooperation Network in China from the Perspective of Multilayer Network 

Figure 8 | Evolution Characteristics of Advanced Nonferrous Metal Industry Patent Cooperation Network in China from the Perspective of Multilayer Network 