F. Ahmad Khalid
Faculty of Materials Science and Engineering GIK Institute of Engineering Sciences and Technology, Topi, NWFP, Pakistan
Muhammad Bashir
Faculty of Materials Science and Engineering GIK Institute of Engineering Sciences and Technology, Topi, NWFP, Pakistan
S. N. Arshad
Faculty of Materials Science and Engineering GIK Institute of Engineering Sciences and Technology, Topi, NWFP, Pakistan