Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Collaboration clusters between countries.
| Clúster | Countries | Publications | Citations |
|---|---|---|---|
| 1 | United States, Brazil, France, Italy, Mexico, Portugal and Spain | 365 | 3831 |
| 2 | UK,Austria, Indonesia, Japan, Malaysia, Romania and Vietnam | 246 | 2338 |
| 3 | India, Germany, Iran, the Netherlands, Russia and South Africa | 295 | 2092 |
| 4 | Australia, Denmark and Sweden | 53 | 533 |
| 5 | Canada, Finland and Turkey | 67 | 842 |
| 6 | China and Poland | 53 | 310 |
Source: Author's own calculation, based on Microsoft Excel software.
