Affiliation: | 1. Department of Mathematics and Statistics, College of Science, Sultan Qaboos University, P.O.Box 36, (123), Alkhoud, Muscat, Oman;2. Department of Mathematics, Faculty of Science, Suez Canal University, Ismailia, Egypt;3. Department of Mathematics, School of Mathematical and Physical Sciences, Central University of Kerala, Riverside Transit Campus, Padennakkad P.O. Nileshwar, Kasaragod 671 314, Kerala, India |