Table 2. Bibliographic coupling data by country

Country	Document	Citations	Total link strength
China	135	1,524	37,000
United Kingdom	11	131	870
Australia	9	234	540
Malaysia	7	84	798
United States	7	911	216
India	4	27	312
Taiwan	4	61	297
Iran	4	64	226
Hongkong	4	71	61
Egypt	3	17	430

Source: VOSviewer.