|
Competitive Enterprise Institute (United States)
71
|
Institute for Energy Research (United States)
24
|
Mathematica Policy Research (United States)
5
|
|
Atlantic Council (United States)
4
|
Brookings Institution (United States)
2
|
Center for Strategic and International Studies (United States)
2
|
|
National Bureau of Economic Research (United States)
2
|
American Enterprise Institute (United States)
1
|
RAND Corporation (United States)
1
|
