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Authors: |
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Yu ̈ksel Soykan - Department of Mathematics,Faculty of Science, Zonguldak Bu ̈lent Ecevit University, Zonguldak, Turkey
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I ̇nci Okumus - Department of Engineering Sciences, Faculty of Engineering, ̇Istanbul University-Cerrahpasa, ̇Istanbul, Turkey
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Melih Go ̈cen - Department of Mathematics,Faculty of Science, Zonguldak Bu ̈lent Ecevit University, Zonguldak, Turkey
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