Figure 3.
WoSCC scientific categories in POP research. Note: X-Axis: Publication year, Y-Axis: Scientific category, Bubble Size: number of works, Colors: citations/work.
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.