Document Type : Original Paper
Authors
1 Department of Mathematics,, Mahabad Branch,, Islamic Azad University,, Mahabad,, Iran
2 Department of Mathematics‎, ‎Urima Branch‎, ‎Islamic Azad University‎, ‎Urima‎, ‎Iran
3 Department of mathematics, Faculty of mathematics and statistics, university of Isfahan, Isfahan Iran.
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