1. National University of Sciences and Technology (NUST), Islamabad, Pakistan
2. Department of Physics, Abdul Wali Khan University, Mardan, 23200, Pakistan
3. Department of Chemistry, College of Science, King Saud University, P. O. Box 2455, Riyadh 11451, Saudi Arabia
4. University of Juba, Department of Mathematics, P. O. Box 82 Juba, Central Equatoria, South Sudan
5. Laboratory of Applied and Theoretical Physics (LPAT), University of Larbi Tebessi, 12000 Tebessa, Algeria
6. Section of Mathematics, International Telematic University Uninettuno, Corso Vittorio Emanuele II, 39, 00186 Roma, Italy