1. Department of Mathematics, Iran University of Science and Technology, Narmak, Tehran 16844, Iran
2. Department of Humanities and Basic Sciences, Military College of Signals, National University of Sciences and Technology, H-12, Islamabad, Pakistan
3. Department of Mathematics, Iran University of Science and Technology, Narmak, Tehran 16844, Iran,
4. Department of Mathematics and Computer Science, Friedrich Schiller University, Jena Ernst-Abbe-Platz, Germany