Aziz-Ul-Hakim
Departmenof Mathematics,
University of Malakand, Chakdara Dir(L), KPK, Pakistan.
Hidayatullah Khan
Departmenof Mathematics,
University of Malakand, Chakdara Dir(L), KPK, Pakistan.
Imtiaz Ahmad
Departmenof Mathematics,
University of Malakand, Chakdara Dir(L), KPK, Pakistan.
Asghar Khan
Department of Mathematics, Abdul Wali Khan University Mardan, KPK, Pakistan