Institution: | a Ibnu Sina Institute for Fundamental Science Studies, Universiti Teknologi Malaysia, 81310 UTM, Johor Bahru, Johor, Malaysia b Department of Mathematics, Faculty of Science, Universiti Teknologi Malaysia, 81310 UTM, Johor Bahru, Johor, Malaysia c Department of Mathematics, College of Science, University of Sulaimani, 64001 UOS, Sulaimani, Kurdistan Region, Iraq d Department of Mathematics, Faculty of Science, Ibb University, P.O. Box 70270, Ibb, Yemen e Department of Mathematics, Faculty of Science, King Khalid University, P.O. Box 9004, Abha, Saudi Arabia |