Journal of the Egyptian Mathematical Society
Journal of the Egyptian Mathematical Society > 2013 > 21 > 3 > 370-378
Journal of the Egyptian Mathematical Society > 2013 > 21 > 3 > 224-232
Journal of the Egyptian Mathematical Society > 2015 > 23 > 3 > 563-567
Journal of the Egyptian Mathematical Society > 2016 > 24 > 3 > 471-478