Arab Journal of Mathematical Sciences
Arab Journal of Mathematical Sciences > 2013 > 19 > 1 > 61-71
Arab Journal of Mathematical Sciences > 2014 > 20 > 2 > 264-279
Arab Journal of Mathematical Sciences > 2013 > 19 > 1 > 61-71
Arab Journal of Mathematical Sciences > 2014 > 20 > 2 > 264-279