Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(A) Network visualization map of document citation analysis generated by VOSviewer. The node size was proportional to the citation times. (B) Top 25 references with the strongest citation bursts. The blue line represented the time axis, and the red bars indicated the burst period.
