1. Department of Mathematics, CSSR & SRRM Degree and PG College, Kamalapuram, India
2. Department of Mathematics and Sciences, College of Humanities and Sciences, Prince Sultan University, Riyadh, Saudi Arabia
3. Department of Mathematics, Air University, Islamabad, Pakistan
4. Department of Mathematics, Government Polytechnic College, Ananthapur, India
5. Department of Mathematics, Faculty of Science, The Hashemite University, Zarqa, Jordan