1. Department of Mathematics, COMSATS University Islamabad,, Lahore Campus, Lahore 54000, Pakistan
2. Gofa Campus, Near Gofa Industrial College and German Adebabay, Nifas Silk-Lafto, 26649, Addis Ababa, Ethiopia
3. Jabalia Campus, United Nations Relief and Works Agency (UNRWA) Palestinian Refugee Camp, Gaza Strip Jabalya, State of Palestine
4. Institute of Mathematical Sciences, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia