1. Bukhara State University,Dept. of Physics,Bukhara,Uzbekistan
2. Urgench State University,Dept. of Physics,Urgench,Uzbekistan
3. University of Information Technologies,Urgench Branch of the Tashkent,Department of Natural Sciences,Urgench,Uzbekistan
4. Physical-Technical Institute, Academy Sciences of Uzbekistan,"Solar Power Plants" Laboratory,Tashkent,Uzbekistan