Creator
- Belgium 5
- Gunnerson, Charles G. 5
- International Desalination Association 5
- Kazakhstan 5
- Kyrgyzstan 5
- Romania 5
- Ukraine 5
- United Nations 5
- Uzbekistan 5
- Belarus 4
- Egypt. Wizārat al-Rayy 4
- Elad, Eli 4
- Société de chimie industrielle (France) 4
- Soviet Union 4
- Tanzania 4
- Austria 3
- Barghouthi, Mustafa 3
- Bellisari, Anna W., 1939- 3
- Benin 3
- Burkina Faso 3