Journal of the Egyptian Mathematical Society
Journal of the Egyptian Mathematical Society > 2015 > 23 > 2 > 440-444
Journal of the Egyptian Mathematical Society > 2015 > 23 > 2 > 410-415
Journal of the Egyptian Mathematical Society > 2016 > 24 > 3 > 479-486
Journal of the Egyptian Mathematical Society > 2017 > 25 > 1 > 79-85