Institution: | 1. Department of Physics, Institute of Natural and Applied Sciences, Abant ?zzet Baysal University, P. B. 14820 G?lk?y Kampüsü, Merkez, Bolu, Turkey 2. Department of Physics, Faculty of Science and Art, Abant ?zzet Baysal University, P. B. 14820, G?lk?y Kampüsü, Bolu, Turkey 3. Department of Physics, Faculty of Science, Dokuz Eylül University, P. B. 35370 T?naztepe Kampüsü, Buca - ?zmir, Turkey
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