Document Type : Research Paper
Authors
1 1. Department of Mathematics, Faculty of Science, University of Maragheh, Box 55136-553, Maragheh, Iran. 2. Department of Mathematics n, Faculty of Basic Science, Khatam-ol-Anbia (PBU) University, Tehran, Iran.
2 Department of Mathematics n, Faculty of Basic Science, Khatam-ol-Anbia (PBU) University, Tehran, Iran.
3 Department of Mathematics, Faculty of Science, University of Maragheh, Box 55136-553, Maragheh, Iran.
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