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The second main stream begins with the middle source node CaidasN2002 [23]. As shown in Figure 6, the second main stream contains 14 representative articles pub- lished between 2002 and 2021. The research topics in the second main stream include:

Figure 6 The second main stream begins with the middle source node CaidasN2002 [23]. As shown in Figure 6, the second main stream contains 14 representative articles pub- lished between 2002 and 2021. The research topics in the second main stream include: