Figure 2
A Venn diagram illustrating the co-authorship relationships among various countries based on the quantity of documents. The diagram features multiple overlapping circles, each representing a different country. The size of each circle indicates the relative number of documents associated with that country. The overlaps between circles signify collaborative work between the respective countries. Notable countries include the USA, England, Peoples Republic of China, Australia, India, Japan, Finland, Italy, Spain, Scotland, and Canada. The USA has the largest circle, indicating the highest number of documents, followed by England and Peoples Republic of China. The overlaps show varying degrees of collaboration, with some countries having more extensive collaborations than others.Based on the quantity of documents, co-authorship of countries can be determined