URL https://scholar.google.com/citations?hl=id&user=jsgTasAAAAAJ&view_op=list_works&cituft=2&email_for_op=ghada.ashraf%40fagr.bu.edu.eg&gmla=AH8HC4yp6hom3WiowX7oyDX8_HYX7jvHBYR7fOrz2j4veOB1VW90C33dmqCRDu0y_u2eJkDh66r7YaQa3-uqY4M04Q