Figure 2.
The image presents a line graph depicting the publication numbers for Academic Literature and Grey Literature from 2011 to 2023. The x-axis is labeled with years from 2011 to 2023, while the y-axis indicates the number of publications, ranging from one to eleven. The graph features two lines: one for Academic Literature, represented in a darker shade, and another for Grey Literature, shown in a lighter shade. Data points for each year are marked with numbers indicating the corresponding publication counts. Academic Literature shows a noticeable increase from 2019 to 2022 before a decline in 2023, peaking at eleven publications in 2022. Grey Literature reflects a steadier trend with fluctuations, peaking at ten publications in 2022 and dropping to five in 2023. The graph uses a clean design with grid lines for clarity.Publication year distribution of selected academic and gray literature in this review
Source: Authors’ own creation