1. Department of Mathematics, Abdul Wali Khan University, Mardan , Khyber Pakhtunkhwa , Pakistan
2. Department of Mathematics, COMSATS University Islamabad , Attock Campus , Punjab , Pakistan
3. Section of Mathematics, International Telematic University Uninettuno, Corso Vittorio Emanuele II, 39 , 00186 Roma , Italy
4. School of Science, Xi’an University of Architecture and Technology , Xi’an 710055 , China
5. Department of General Education, Faculty of Science and Health Technology, Navamindradhiraj University , Bangkok , 10300 , Thailand
6. Department of Statistics, Faculty of Science, Ramkhamhaeng University , Bangkok , 10240 , Thailand