Document Type : Research Paper
Authors
1 Abdus Salam School of Mathematical Sciences, GC University, 68-B, New Muslim Town, Lahore 54600, Pakistan
2 Faculty of Mathematics and Computer Science, Ovidius University Bd. Mamaia 124, 900527 Constanta, and Lumina-The University of South-East Europe Sos. Colentina nr. 64b, Bucharest, Romania
3 Faculty of Mathematics and Computer Science, Ovidius University, Bd.\ Mamaia 124, 900527 Constanta, Romania, and Simion Stoilow Institute of Mathematics of the Romanian Academy, Research group of the project ID-PCE-2011-1023, P.O.Box 1-764, Bucharest 014700, Romania
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