Journal of the Egyptian Mathematical Society
Journal of the Egyptian Mathematical Society > 2013 > 21 > 1 > 32-37
Journal of the Egyptian Mathematical Society > 2016 > 24 > 4 > 638-643
Journal of the Egyptian Mathematical Society > 2017 > 25 > 2 > 141-150
Journal of the Egyptian Mathematical Society > 2017 > 25 > 2 > 252-261