Document Type : Research Note
Authors
1 Islamic Azad University, College of Science, Department of Physics, Tabriz-Branch, Tabriz, Iran
2 Research Institute for Astronomy and Astrophysics of Maragha (RIAAM) Maragha, Iran, P. O. Box: 55134-441 & Iranian space agency, 34, Sayeh St. Vali-Asr Av. Tehran, Iran, Fax: 22039193-94
Abstract
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