1. Kırıkkale University, Department of Physics, Faculty of Arts and Science, Merkez Campus, 71450 Kırıkkale, Turkey
2. Ankara University, Department of Physics, Faculty of Science 06100 Tandoğan, Ankara, Turkey
3. Başkent University, Faculty of Engineering, Baglıca Campus Eskişehir Yolu 20. Km. Baglıca, 06530 Ankara