Figure 4
The line graph titled Bradford's Law displays the cumulative number of articles on the y axis and the source log rank on the x axis. The graph is divided into three zones: Core, Zone 2, and Zone 3, with the number of sources indicated for each zone. The black line represents the actual data, while the red dashed line represents the fitted model. The graph includes labels for the equation, R squared value, Bradford multiplier, and KS p-value. All values are approximated.Distribution of research in environmental sustainability based on Bradford's law of scattering