1. Ibtisam Aldawish:
School of Mathematical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia,Bangi 43600, Selangor Darul Ehsan,Malaysia
2. Maslina Darus:
School of Mathematical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia,Bangi 43600, Selangor Darul Ehsan,Malaysia