Faisal A.M. Binjadhnan and Tahir Ahmad
American Journal of Applied Sciences 7 ( 4 ): 540 - 544 , 2010
American Journal of Applied Sciences 7 ( 11 ): 1470 - 1476 , 2010
Tahir Ahmad, Siti Suhana Jamian and Jamalludin Talib
Journal of Mathematics and Statistics 6 ( 2 ): 151 - 156 , 2010
Izaz Ullah Khan, Tahir Ahmad and Normah Maan
Research Journal of Applied Sciences 7 ( 2 ): 100 - 107 , 2012