Figure 4 The top 50 co-cited references with the strongest citation bursts sorted by burst time. The burst detection was based on the citations made by the top 50 articles per year during the 12-year period, and the top 100 references with the strongest citation bursts from 2010 to 2021 were identified. Citation burst information include citation information, citation burst strength, burst start time, burst end time, and burst start-to-end time axis diagram. Red bars: Duration of burst. (Software: CiteSpace 5.7.R5W, Drexel University, Philadelphia, USA).