Author
United States,
180
United States. Department of State,
171
United States. Department of State
74
Korea (South),
13
France,
9
Netherlands,
9
SpringerLink (Online service)
9
India,
7
ScienceDirect (Online service)
7
United States
7
China,
6
Japan,
6
Saudi Arabia,
6
Mexico,
5
Poland,
5
Sweden,
5
Ukraine,
5
Australia,
4
Belgium,
4
Canada,
4
Finland,
4
France
4
Greece,
4
Nūai Bor̨̄ihān læ Čhatkān Thun dān Kānphœm̄ Khwāmsāmāt nai Kānkhæn̄gkhan khon̨̄g Prathēt (Thailand),
4
Singapore,
4
Brazil,
3
Bulgaria,
3
Croatia,
3
Czech Republic,
3
Estonia,
3
Euratom,
3
Germany
3
Germany,
3
Great Britain
3
Great Britain,
3
Hungary,
3
India
3
Italy
3
Italy,
3
Jordan,
3
Korea (South)
3
Lithuania,
3
Spain,
3
Switzerland,
3
Turkey,
3
Algeria,
2
Argentina,
2
Armenia (Republic),
2
Australia
2
Chile
2
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