Arab Journal of Mathematical Sciences
Arab Journal of Mathematical Sciences > 2011 > 17 > 2 > 75-88
Arab Journal of Mathematical Sciences > 2012 > 18 > 1 > 51-59
Arab Journal of Mathematical Sciences > 2011 > 17 > 2 > 75-88
Arab Journal of Mathematical Sciences > 2012 > 18 > 1 > 51-59