1. PG and Research Department of Mathematics, Cauvery College for Women (Affiliated to Bharathidasan University), Tiruchirappalli 620018, Tamil Nadu, India
2. Department of Mathematics, Yildiz Technical University, Faculty of Arts and Science, Esenler 34210, Istanbul, Turkey
3. Department of Mathematics and Statistics, International Islamic University Islamabad, Islamabad, Pakistan
4. University of Massachusetts Medical School (UMASS), Worcester, MA 01655, USA
5. Department of Logistics, University of Defence in Belgrade, Belgrade, Serbia
6. College of Education, Applied Sciences and Arts, Amran University, Amran, Yemen