Figure 1.

(a) Network visualization of bibliometric analysis of high-frequency keyword graphs over time and clustering of keyword citation networks. (b) Overlay visualization of bibliometric analysis of high-frequency keyword graphs over time and clustering of keyword citation networks. (c) Density visualization of bibliometric analysis. Term lines, circles, and other colors in a bibliometric network represent the degree of connectedness. The label and circle of an object grow in size in proportion to its weight. The size of the label and the matching circle that represents the object change in tandem with the item’s weight. A chronology is shown using a red-to-blue color gradient, with red designating earlier articles and blue representing more recent ones. This gradient acts as a visible counter for the passage of time. Red highlights important or noteworthy content, such as prominent citations, influential writings, or often-cited sources, while the more recent works, developing fads, or sources considered foundational in a certain discipline may all be represented by the color blue. Additionally, this may identify sources with a certain theme or content.