Herfindahl–Hirschman index (HHI)
| Country | 4,960.18 | Very high concentration |
| Journal | 397.60 | Low concentration |
| Institution | 447.40 | Low concentration |
| Research Area | 3,529.59 | Very high concentration |
| Author | 303.63 | Low concentration |
| Country | 4,960.18 | Very high concentration |
| Journal | 397.60 | Low concentration |
| Institution | 447.40 | Low concentration |
| Research Area | 3,529.59 | Very high concentration |
| Author | 303.63 | Low concentration |
Source(s): Own elaboration. Authors’ own work
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