Figure9

Figure 9. Statistical charts of references in this survey: (a) a pie chart that shows the proportion of publications in journals or conferences; and (b) a bar chart about the number of publications per year (from 2017 to 2021).
Figure 9. Statistical charts of references in this survey: (a) a pie chart that shows the proportion of publications in journals or conferences; and (b) a bar chart about the number of publications per year (from 2017 to 2021).
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