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